Question

我无法让子类正常运行。实例化超类时，一切都按预期工作。但是子类中的吸气剂和制定者似乎没有做任何事情。

注释掉对超类__init__函数的调用没有任何效果，就好像它甚至不存在一样。

class Animal:
    __name = None
    __sound = 0

    def __init__(self, name, sound):
        self.__name = name
        self.__sound = sound

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

    def get_name(self):
        return self.__name

    def get_sound(self):
        return self.__sound

    def get_type(self):
        return "Animal"

    def toString(self):
        return "{} says {}".format(self.__name, self.__sound)

class Dog(Animal):
    __owner = None

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

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

    def get_owner(self):
        return self.__owner

    def get_type(self):
        return "Dog"

    def toString(self):
        return "{} says {} and his owner is {}".format(self.__name, self.__sound, self.__owner)

cat = Animal('Whiskers', 'Meow')
print(cat.toString())

spot = Dog("Spot", "Borf!", "Derek")
spot.set_name = "Spot?"
spot.set_owner = "Brad"
print(spot.get_type())
print(spot.get_name())
print(spot.get_owner())
print(spot.toString())
print(spot.multiple_sounds(howmany=4))

给定的输出如下：

Whiskers says Meow
Dog
Spot
Derek
Traceback (most recent call last):
  File "./hellopython.py", line 245, in <module>
    print(spot.toString())
  File "./hellopython.py", line 228, in toString
    return "{} says {} and his owner is {}".format(self.__name, self.__sound, self.__owner)
    AttributeError: 'Dog' object has no attribute '_Dog__name'

我不明白，因为我希望更改名称和所有者。为什么不能在超类init函数之外获取或设置任何东西？我正在使用python 3，关于这个主题的其他帖子建议将类中的参数设置为super（仅限python 2，尝试过它并且仍然无法工作）。为什么在这种情况下无法访问属性？

无法在Python3中创建功能正常的子类

0 个答案: