《精通Python设计模式》学习结构型之适配器模式

Posted 2020-12-27 aguncn

大名鼎鼎~~

在兼容老系统和其它系统外调用时，用得着~

class Synthesizer:
    def __init__(self, name):
        self.name = name

    def __str__(self):
        return ‘the {} synthesizer‘.format(self.name)

    def play(self):
        return ‘is playing an electronic song‘

class Human:
    def __init__(self, name):
        self.name = name

    def __str__(self):
        return ‘{} the human‘.format(self.name)

    def speak(self):
        return ‘says hello‘

from extenrnal import Synthesizer, Human

class Computer:
    def __init__(self, name):
        self.name = name

    def __str__(self):
        return ‘the {} computer‘.format(self.name)

    def execute(self):
        return ‘executes a program‘

class Adapter:
    def __init__(self, obj, adapted_methods):
        self.obj = obj
        self.__dict__.update(adapted_methods)

    def __str__(self):
        return str(self.obj)

def main():
    objects = [Computer(‘Intel‘)]
    synth = Synthesizer(‘moog‘)

    objects.append(Adapter(synth, dict(execute=synth.play)))

    human = Human(‘Bob‘)
    objects.append(Adapter(human, dict(execute=human.speak)))

    for i in objects:
        print(‘{} {}‘.format(str(i), i.execute()))

if __name__ == "__main__":
    main()