Python实现代理模式
from abc import ABCMeta, abstractmethod NOT_IMPLEMENTED = "You should implement this." class AbstractCar: __metaclass__ = ABCMeta @abstractmethod def drive(self): raise NotImplementedError(NOT_IMPLEMENTED) class Car(AbstractCar): def drive(self): print("Car has been driven!") class Driver(object): def __init__(self, age): self.age = age class ProxyCar(AbstractCar): def __init__(self, driver): self.car = Car() self.driver = driver def drive(self): if self.driver.age <= 16: print("Sorry, the driver is too young to drive.") else: self.car.drive() driver = Driver(16) car = ProxyCar(driver) car.drive() driver = Driver(25) car = ProxyCar(driver) car.drive()
摘自:wiki
作者:Standby — 一生热爱名山大川、草原沙漠,还有我们小郭老师!
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出处:http://www.cnblogs.com/standby/
本文版权归作者和博客园共有,欢迎转载,但未经作者同意必须保留此段声明,且在文章页面明显位置给出原文连接,否则保留追究法律责任的权利。