오버라이딩

• 상속 관계에 있는 부모 클래스에서 이미 정의된 메소드를 자식 클래스에서 같은 시그니쳐를 갖는 메소드로 다시 정의하는 것

class Robot:
    population = 10

    def __init__(self, name):
        self.name = name
        Robot.population += 1

    def die(self):
        print(f"{self.name} is being destroyed!")
        Robot.population -= 1
        if Robot.population == 0:
            print(f"{self.name} was the last")
        else:
            print(f"there are still {Robot.population} remain")

    def say_hi(self):
        print(self)
        print(f"my master call me {self.name}")

    def cal__add(self, a, b):
        return a + b

    @classmethod
    def how_many(cls):
        return f"we have {cls.population} robots"


class Siri(Robot):
    age = 10

    def __init__(self, name, age):
        self.name=name
        self.age = age

    def say_hi(self):
        print(f"my master call me {self.name} by apple")

    @classmethod
    def how_many(cls):
        return f"we have {cls.population} robots by apple"


siri = Siri("iphone7", 20)
siri.say_hi()

print(Siri.how_many())

my master call me iphone7 by apple
we have 11 robots by apple

super

• 부모클래스의 임시적인 객체를 반환하여 부모클래스의 메소드를 사용할 수 있게 하는 것

class Robot:
    population = 10

    def __init__(self, name):
        self.name = name
        Robot.population += 1

    def die(self):
        print(f"{self.name} is being destroyed!")
        Robot.population -= 1
        if Robot.population == 0:
            print(f"{self.name} was the last")
        else:
            print(f"there are still {Robot.population} remain")

    def say_hi(self):
        print(f"my master call me {self.name}")

    def cal__add(self, a, b):
        return a + b

    @classmethod
    def how_many(cls):
        return f"we have {cls.population} robots"


class Siri(Robot):
    age = 10

    def __init__(self, name, age):
        super().__init__(name)
        self.age = age

    def say_hi(self):
        super().say_hi()
        print(f"my master call me {self.name} by apple")

    @classmethod
    def how_many(cls):
        return super().how_many()


siri = Siri("iphone7", 20)
siri.say_hi()

print(Siri.how_many())

my master call me iphone7
my master call me iphone7 by apple
we have 11 robots