Pažljivo pročitaj kod

class Tracker:
    def __set_name__(self, owner, name):
        self.name = name
        print(f"bind:{name}")
    def __get__(self, instance, owner):
        if instance is None:
            return self
        print(f"get:{self.name}")
        return instance.__dict__.get(self.name, 0)
    def __set__(self, instance, value):
        print(f"set:{self.name}={value}")
        instance.__dict__[self.name] = value


class Box:
    x = Tracker()
    y = Tracker()


b = Box()
b.x = 10
b.y = 5
total = b.x + b.y
print(total)

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