我最近开始学习python,并且我很难在python中如何继承。python中的继承,属性错误
我创建了两个类,一个名为Animal,另一个名为Dog。 Dog类继承Animal类。我在动物类中有一些属性,如名称,高度,声音等,我想在Dog类中使用。我使用init动物类的方法设置属性。
class Animal:
__name = ""
__height = 0
__weight = 0
__sound = 0
def __init__(self, name, height, weight, sound):
self.__name = name
self.__height = height
self.__wight = weight
self.__sound = sound
def set_name(self, name):
self.__name = name
def get_name(self):
return self.__name
def set_height(self, height):
self.__height = height
def get_height(self):
return self.__height
def set_weight(self, weight):
self.__weight = weight
def get_weight(self):
return self.__weight
def set_sound(self, sound):
self.__sound = sound
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)
cat = Animal("whiskers", 50, 20, "meow")
print(cat.tostring())
class Dog(Animal):
__owner = None
def __init__(self, name, height, weight, sound, owner):
super(Dog, self).__init__(name, height, weight, sound)
self.__owner = owner
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)
def multiple_sounds(self, how_many=None):
if how_many is None:
print(self.get_sound())
else:
print(self.get_sound() * how_many)
my_dog = Dog("spot", 50, 40, "Ruff", "Derek")
print(my_dog.tostring())
问题是当我尝试打印使用Dog类的对象的所有属性,会显示一个错误,说“
*line 73, in tostring
return '{} is {} cm tall and {} kilograms and says {} His owner is {}'.format(self.__name,
AttributeError: 'Dog' object has no attribute '_Dog__name'*
谁能帮我看看这个问题在这个代码?
问题通过将双下划线更改为单下划线解决。谢谢您的帮助 ! – Yousaf