백준 10845번 큐 python 파이썬

https://www.acmicpc.net/problem/10845

10845번: 큐

import sys
import queue

num = int(sys.stdin.readline())

q = queue.Queue()

for i in range(num):
    order = sys.stdin.readline().strip()

    if order.split()[0] == 'push':
        q.put(order.split()[1])
    elif order == 'pop':
        print(-1 if q.empty() else q.get())
    elif order == 'size':
        print(q.qsize())
    elif order == 'empty':
        print(1 if q.empty() else 0)
    elif order == 'front':
        print(-1 if q.empty() else q.queue[0])
    elif order == 'back':
        print(-1 if q.empty() else q.queue[-1])