5.1.2 把链表当作队列使用 Using Lists as Queues

You can also use a list conveniently as a queue, where the first element added is the first element retrieved (``first-in, first-out''). To add an item to the back of the queue, use append(). To retrieve an item from the front of the queue, use pop() with 0 as the index. For example:

你也可以把链表当做队列使用，队列作为特定的数据结构，最先进入的元素最先释放（先进先出）。使用 append()方法可以把元素添加到队列最后，以0为参数调用 pop() 方法可以把最先进入的元素释放出来。例如：

>>> queue = ["Eric", "John", "Michael"]
>>> queue.append("Terry")           # Terry arrives
>>> queue.append("Graham")          # Graham arrives
>>> queue.pop(0)
'Eric'
>>> queue.pop(0)
'John'
>>> queue
['Michael', 'Terry', 'Graham']