21 leetcode - Valid Parentheses
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#!/usr/bin/python# -*- coding: utf-8 -*-'''英文:Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.中文:括号配对,没有配对成功的话返回False,成功返回True举例:The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]" and "([)]" are not.'''class Solution(object): def isValid(self,s): length = len(s) if length & 1 or length == 0: #字符串个数为奇数/字符串为空 return False ret = True stack = [] left = ('{','(','[') right = ('}',')',']') for i in s: if i in left: stack.append(i) elif i in right: if len(stack) < 1: ret = False break if stack.pop() == left[right.index(i)]: continue else: ret = False break else: ret = False break if len(stack) > 0: #有剩余的话,说明无法配对 ret = False return ret 0 0
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