# # # @param s string字符串 # @return bool布尔型 # class Solution: def isValid(self , s ): # write code here stack = [ ] if len(s) == 1 or len(s)%2 !=0: return False else: stack = [] dict ={'(':')','[':']','{':'}'} for i in s: if i in dict: stack.append(dict.get(i)) else: if stack: if i== stack[-1]: stack.pop() if len(stack)==0: return True else: return False