[Python] 괄호 회전하기

https://school.programmers.co.kr/learn/courses/30/lessons/76502

프로그래머스

# 괄호 회전하기

def solution(s):
    answer = 0
    for _ in range(len(s)):
        stack = []
        for i in s:
            if stack == []:
                stack.append(i)
            elif stack[-1] == '(' and i==')':
                stack.pop()
            elif stack[-1] =='[' and i==']':
                stack.pop()
            elif stack[-1] == '{' and i=='}':
                stack.pop()
            else:
                stack.append(i)
        if stack==[]:
            answer += 1
        s = s[1:] + s[0]
    return answer