Python：TypeError：__ init __（）需要5个参数（给定6个）

Question

我在使用此代码时遇到此问题，我不确定为什么我仍然会在此处获得此类型错误。我有以下Animal类，它是下面定义的Dog类的基类。我想创建一个继承自这个Animal类的Dog对象。

这是动物类：

class Animal(object):
    __name = None
    __height = None
    __weight = None
    __sound = None

    def __init__(self, name, height, weight, sound):
        self.__name = name
        self.__height = height
        self.__weight = weight
        self.__sound = sound

    def set_name(self, name):
        self.__name = name

    def set_height(self, height):
        self.__height = height

    def set_weight(self, height):
        self.__height = height

    def set_sound(self, sound):
        self.__sound = sound

    def get_name(self):
        return self.__name

    def get_height(self):
        return str(self.__height)

    def get_weight(self):
        return str(self.__weight)

    def get_sound(self):
        return self.__sound

    def get_type(self):
        print("Animal")

    def toString(self):
        return "{} is {} cm tall and {} kilograms and says {}".format(self.__name, self.__height, self.__weight, self.__sound)

然后我有以下Dog类继承自上面的Animal类：

class Dog(Animal):
    __owner = None

    def __init__(self, name, height, weight, sound, owner):
        self.__owner = owner
        super(Dog, self).__init__(self, name, height, weight, sound)

    def set_owner(self, owner):
        self.__owner = owner

    def get_owner(self):
        return self.__owner

    def get_type(self):
        print("Dog")

    def toString(self):
        return "{} is {} cm tall and {} kilograms and says {}. His owner is {}".format(self.__name, self.__height, self.__weight, self.__sound, self.__owner)

当我尝试使用以下代码创建Dog对象时：

spot = Dog('Spot', 22, 11, 'Bark', 'John')

我得到以下TypeError：

TypeError: __init__() takes exactly 5 arguments (6 given)

有谁知道我为什么会收到此错误？我真的不明白这里发生了什么。

提前致谢！

编辑：从超类中取出self后，当我尝试以下代码时，我现在收到AttributeError: 'Dog' object has no attribute '_Dog__name'：

print(spot.toString())

Answer 1

问题存在于超类的__init__方法中。 super()调用隐式传递self作为第一个参数。只需使用：

def __init__(self, name, height, weight, sound, owner):
    self.__owner = owner
    super(Dog, self).__init__(name, height, weight, sound)

仅当您通过名称引用超类时才需要显式自我。

def __init__(self, name, height, weight, sound, owner):
    self.__owner = owner
    Animal.__init__(self, name, height, weight, sound)