#!/usr/bin/env python

# -*- coding:UTF-8

__author__ = 'shenshijun'

import copy

class Queue(object):

"""

使用Python的list快速实现一个队列

"""

def __init__(self, *arg):

super(Queue, self).__init__()

self.__queue = list(copy.copy(arg))

self.__size = len(self.__queue)

def enter(self, value):

self.__size += 1

self.__queue.append(value)

def exit(self):

if self.__size <= 0:

return None

else:

value = self.__queue[0]

self.__size -= 1

del self.__queue[0]

return value

def __len__(self):

return self.__size

def empty(self):

return self.__size <= 0

def __str__(self):

return "".join(["Queue(list=", str(self.__queue), ",size=", str(self.__size)])