封装与可扩展性

class Room:
    def __init__(self,name,owner,weight,length):
        self.name=name
        self.owner=owner

        self.__weight=weight
        self.__length=length


    def tell_area(self):
        return self.__weight*self.__length


r=Room('卫生间','alex',10,10)

print(r.tell_area())