duck_typing.py

# 덕타이핑

class Person(object):
    def __init__(self, age=1):
        self.age = age
    def drive(self):
        if self.age >= 18:
            print('ok')
        else:
            raise Exception('No drive')

class Baby(Person):
    def __init__(self, age=1):
        if age < 18:
            super().__init__(age)
        else:
            raise ValueError

class Adult(Person):
    def __init__(self, age=18):
        if age >= 18:
            super().__init__(age)
        else:
            raise ValueError

baby = Baby()
adult = Adult()

class Car(object):
    def __init__(self, model=None):
        self.model = model
    def run(self):
        print('run')
    def ride(self, person):
        person.drive()

car = Car()
car.ride(adult)


class HyundaiCar(Car):
    def run(self):
        print('fast')

class TeslaCar(Car):
    def __init__(self, model='Model S', enable_auto_run=False, passwd='123'):
        super().__init__(model)
        self._enable_auto_run = enable_auto_run
        self.passwd = passwd

    @property
    def enable_auto_run(self):
        return self._enable_auto_run

    @enable_auto_run.setter
    def enable_auto_run(self, is_enable):
        if self.passwd == '456':
            self._enable_auto_run = is_enable
        else:
            raise ValueError

    def run(self):
        print('super fast')

    def auto_run(self):
        print('auto run')