當我覆蓋子類中訪問該子類中引入的屬性的方法時，我試圖找出出現 Attribute 錯誤的原因。在下面的代碼中，您可以看到B工作正常，但僅當我在C.我想我可能不得不再次調用 populate 方法，但事實并非如此。# some class that uses a method to populate one of it's attributesclass A:    def __init__(self):        self.populate()    # The original populating method    def populate(self):        self.x = 5my_obj = A()print(my_obj.x)# I can make a subclass that works fine AND has a new attributeclass B(A):    def __init__(self):        super().__init__()        self.y = 9    def populate(self):        self.x = 5my_obj = B()print(my_obj.x)print(my_obj.y)class C(A):    def __init__(self):        super().__init__()        self.z = 7        self.populate()    # This method overides the original one and causes an attribute error    # because self.z is unknown    def populate(self):        self.x = self.zmy_obj = C()print(my_obj.x)