17. 클래스 상속과 super, 오버라이딩

1class Animal:
2    count = 0
3 
4    def __init__(self, name):
5        self.name = name
6        Animal.count += 1
7 
8    def sound(self):
9        return "..."
10 
11    def speak(self):
12        return self.name + ":" + self.sound()
13 
14 
15class Dog(Animal):
16    def __init__(self, name, age):
17        super().__init__(name)
18        self.age = age
19 
20    def sound(self):
21        return "멍"
22 
23 
24class Puppy(Dog):
25    def sound(self):
26        return super().sound() * 2
27 
28 
29pets = [Animal("고양이"), Dog("바둑", 3), Puppy("초코", 1)]
30for p in pets:
31    print(p.speak())
32print(Animal.count, pets[2].age)