Verarbeitung in Python beenden

# -*- coding: utf-8 -*-

class Queue(object):

    def __init__(self):
        self.queue_list = []

    def enqueue(self, value):
        self.queue_list.append(value)

    def dequeue(self):
        try:
            #Extrahieren Sie den Anfang
            value = self.queue_list.pop(0)
        except IndexError:
            value = None

        return value

if __name__ == '__main__':
    queue = Queue()

    queue.enqueue("a")
    queue.enqueue("b")
    queue.enqueue("c")

    print queue.dequeue()
    print queue.dequeue()
    print queue.dequeue()
    print queue.dequeue()

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