49. 클래스 변수와 인스턴스 변수의 가림

1class Counter:
2    total = 0
3    step = 1
4 
5    def __init__(self, name):
6        self.name = name
7        self.value = 0
8        Counter.total += 1
9 
10    def tick(self):
11        self.value += self.step
12        self.step += 1
13        return self
14 
15    def __add__(self, other):
16        return self.value + other.value
17 
18    def __str__(self):
19        return f"{self.name}({self.value})"
20 
21 
22a = Counter("A")
23b = Counter("B")
24a.tick().tick()
25Counter.step = 10
26b.tick()
27c = Counter("C")
28for obj in [a, b, c]:
29    print(obj, obj.step)
30print(a + b, Counter.total, Counter.step)