NameError: name xxxxxx is not defined

python编程，从入门到实践 9_6 错题

Traceback (most recent call last):
File "9_6.py", line 46, in <module>
my_flavors =IceCreamStand('Hoagen Dazs' , 'ice-cream')
File "9_6.py", line 40, in __init__
self.flavors = orange
NameError: name 'orange' is not defined

 

# # coding=GBK
class Restaurant():
    """餐厅的描述"""
    def __init__ (self , restaurant_name , cuisine_type):
        """初始化属性值restaurant_name和cuisine_type"""
        self.restaurant_name = restaurant_name
        self.cuisine_type = cuisine_type
        self.number_served = 0
        
    def describe_restaurant(self):
        """描述餐厅"""
        print(self.restaurant_name.title() + " is very good.")
        print("My restaurant is good at " + self.cuisine_type + " .")
        
    def open_restaurant(self):
        """开放中的餐厅"""
        print(self.restaurant_name.title() + " is opening!")
        
    def restaurant_number(self):
        """打印到餐厅用餐的人数"""
        print("There are " + str(self.number_served) + " people!")
        
    def change_number(self , person):
        """修改餐厅人数"""
        self.number_served = person
        
    def increment_number_served(self , person):
        """将人数进行递增"""
        self.number_served += person

class IceCreamStand(Restaurant):
    """一家冰激凌店"""
    
    def __init__ (self , restaurant_name , cuisine_type):
        """
        初始化餐厅的属性
        初始化冰激凌店的属性
        """
        super(). __init__ (restaurant_name , cuisine_type)
        self.flavors = orange
        
    def flavors_food(self):
        """打印一条喜欢冰激凌口味的消息"""
        print("I like " + self.flavors + "'s ice-cream.")
        
my_flavors =IceCreamStand('Hoagen Dazs' , 'ice-cream')
print(my_flavors.describe_restaurant())
my_flavors.flavors_food()

发现是第40行内的orange的单引号忘记加了！！！！！啊啊啊啊