py的话怎么写啊

n = int(input())
list1 = []
for i in range(n):
    m = input()
    if int(m[0]) == 1:
        list1.append(m[2:])
    elif int(m) == 2:
        if len(list1) == 0:
            print("ERR_CANNOT_QUERY")
        else:
            list1.pop(0)
    elif int(m) == 3:
        if len(list1) == 0:
            print("ERR_CANNOT_QUERY")
        else:
            print(list1[0])
    elif int(m) == 4:
        print(len(list1))
    print()