Question

我有3个班级（City，Neighborhood和Block）。

以下是City类的定义：

class City:
    def __init__(self, id_city, name_city):
        self.__id = id_city
        self.__name = name_city

Neighborhood：

的定义

class Neighborhood(City):
    def __init__(self, id_neighborhood, name_neighborhood, number_block, *city_args, **kwargs):
        City.__init__(self, *city_args, **kwargs)
        self.__id = id_neighborhood
        self.__name = name_neighborhood
        self.__number = number_block

Block：

的定义

class Block(Neighborhood):
    def __init__(self, id_block, number_block, number_flats, *neighborhood_args, **kwargs):
        Neighborhood.__init__(*neighborhood_args, **kwargs)
        self.__id = id_block
        self.__number_b = number_block
        self.__number_f = number_flats

然后我宣布实体：

city = City(5, "New York")
neighborhood = Neighborhood(1, "Brooklyn", 500, 5, "New York")
block = Block(11, 2, 20, 1, "Brooklyn", 500, 5, "New York")

并收到此错误：

AttributeError: 'int' object has no attribute '_City__id'

Answer 1

您忘记在self实施中传递Block.__init__()：

Neighborhood.__init__(*neighborhood_args, **kwargs)

所以传入的第一个参数是整数。现在Neighbourhood.__init__()已将self绑定到1，您就会收到错误消息。只需添加self：

class Block(Neighborhood):
    def __init__(self, id_block, number_block, number_flats, *neighborhood_args, **kwargs):
        Neighborhood.__init__(self, *neighborhood_args, **kwargs)

从派生类派生一个类

1 个答案: