我最近開始學習python,並且我很難在python中如何繼承。python中的繼承,屬性錯誤
我創建了兩個類,一個名爲Animal,另一個名爲Dog。 Dog類繼承Animal類。我在動物類中有一些屬性,如名稱,高度,聲音等,我想在Dog類中使用。我使用init動物類的方法設置屬性。
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())
問題是當我嘗試打印使用Dog類的對象的所有屬性,會顯示一個錯誤,說「
*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'*
誰能幫我看看這個問題在這個代碼?
問題通過將雙下劃線更改爲單下劃線解決。謝謝您的幫助 ! – Yousaf