使用列表模拟队列操作

class Queue:
    def __init__(self):
        self.__data = []
    def push(self,value):
        self.__data.append(value)
    def get(self):
        if self.__data:
            return self.__data.pop(0)
        else:
            print("queue is empty")

queue = Queue()
queue.push(2)
queue.push(3)
queue.push(4)
print(queue.get())
print(queue.get())
print(queue.get())

2
3
4