AttributeError: 'Restaurant' object has no attribute 'flavours' - why?

Question

## class restaurant ##

Implemented superclass

class Restaurant():
def __init__(self, restaurant_name, cuisine_type):
    self.restaurant_name = restaurant_name
    self.cuisine_type = cuisine_type 
def describe_restaurant(self):
    print('This restaurant is called ' + self.restaurant_name + '.')
    print('This restaurant serves dishes acoording to ' + self.cuisine_type + '.')
def open_restaurant(self, hours):
    self.hours = hours
    print(self.restaurant_name.title() + ' is opened ' + str(hours) + '!')

class IceCreamStand(Restaurant):
def __init__(self, restaurant_name, cuisine_type):
    super().__init__(restaurant_name, cuisine_type)
    self.restaurant_name = restaurant_name
    self.cuisine_type = cuisine_type
    flavours = ['chocolate', 'vanilia', 'strawberry', 'lime', 'orange']
def flavours(self):
    print('Available flavours: ')
    for flavour in flavours:
        print(flavour)
IceCreamStand  = Restaurant(' Matt IceCream ', 'ice creams')
IceCreamStand.describe_restaurant()
IceCreamStand.flavours()

Answer 1

因为Restaurant，的确，没有属性flavours； IceCreamStand 会，或者至少会，直到您将 class 替换为 Restaurant 和 IceCreamStand = Restaurant(...) 的实例。

使用不同的变量名称（camel-case 用于 class 名称，snake-case 首字母小写用于对象），并创建 IceCreamStand.[=17 的实例=]

ice_cream_stand = IceCreamStand(' Matt IceCream ', 'ice creams')

Answer 2

关闭这个循环，以防其他初学者尝试理解 Python/tackling 中 OOP 的属性错误，这些错误按数量级排列：

检查缩进 - 方法需要在 class 内缩进（见下文）
继承的属性不需要 re-instantiated（即 IceCreamStand 中的餐厅名称和美食类型不需要在调用 super().__init__ 因为这会将它们传递给 Restaurant class 的 __init__ 方法，并使它们可以在 IceCreamStand[=26= 中访问] class)

传递给方法的参数应该像常规函数一样被自己引用，除非你有意想在调用方法时实例化属性（而不是在创建对象和 __init__ 方法时被称为)

请参阅下面的 changes/running 代码：

class Restaurant: def __init__(self, restaurant_name, cuisine_type): self.restaurant_name = restaurant_name self.cuisine_type = cuisine_type def describe_restaurant(self): print('This restaurant is called ' + self.restaurant_name + '.') print('This restaurant serves dishes acoording to ' + self.cuisine_type + '.') def open_restaurant(self, hours): print(self.restaurant_name.title() + ' is opened ' + str(hours) + '!') class IceCreamStand(Restaurant): def __init__(self, restaurant_name, cuisine_type): super().__init__(restaurant_name, cuisine_type) self.flavours = \ ['chocolate', 'vanilia', 'strawberry', 'lime', 'orange'] def flavours(self): print('Available flavours: ') for flavour in self.flavours: print(flavour) stand = IceCreamStand(' Matt IceCream ', 'ice creams') stand.describe_restaurant() stand.flavours()

AttributeError: 'Restaurant' object has no attribute 'flavours' - why?

AttributeError: 'Restaurant' object has no attribute 'flavours' - why?

python

class

attributeerror