9-1 餐馆 :创建一个名为Restaurant 的类,其方法init() 设置两个属性:restaurant_name 和cuisine_type 。创建一个名为describe_restaurant() 的方法和一个名为open_restaurant() 的方法,其中前者打印前述两项信息,而后者打印一条消息,指出餐馆正在营业。
根据这个类创建一个名为restaurant 的实例,分别打印其两个属性,再调用前述两个方法。
class Restaurant():
def __init__(self,a,b):
self.restaurant_name=a
self.cuisine_type=b
def describe_restaurant(self):
print("Restaurant_name is "+self.restaurant_name)
print("Cuisine type is "+self.cuisine_type)
def open_restaurant(self):
print("The restaurant is open now")
restaurant=Restaurant("subway","food")
restaurant.describe_restaurant()
restaurant.open_restaurant()
输出:
Restaurant_name is subway
Cuisine type is food
The restaurant is open now
9-4 就餐人数 :在为完成练习9-1而编写的程序中,添加一个名为number_served 的属性,并将其默认值设置为0。根据这个类创建一个名为restaurant 的实例;打印有多少人在这家餐馆就餐过,然后修改这个值并再次打印它。
添加一个名为set_number_served() 的方法,它让你能够设置就餐人数。调用这个方法并向它传递一个值,然后再次打印这个值。
添加一个名为increment_number_served() 的方法,它让你能够将就餐人数递增。调用这个方法并向它传递一个这样的值:你认为这家餐馆每天可能接待的就餐人数。
class Restaurant():
def __init__(self,a,b,c=0):
self.restaurant_name=a
self.cuisine_type=b
self.number_served=c
def describe_restaurant(self):
print("Restaurant_name is "+self.restaurant_name)
print("Cuisine type is "+self.cuisine_type)
def open_restaurant(self):
print("The restaurant is open now")
def set_number_served(self,num):
self.number_served=num
def increment_number_served(self):
self.number_served=self.number_served+1
restaurant=Restaurant("subway","food")
restaurant.describe_restaurant()
restaurant.open_restaurant()
print("number_served is "+str(restaurant.number_served))
restaurant.set_number_served(3)
print("number_served is "+str(restaurant.number_served))
restaurant.increment_number_served()
print("number_served is "+str(restaurant.number_served))
输出:
Restaurant_name is subway
Cuisine type is food
The restaurant is open now
number_served is 0
number_served is 3
number_served is 4
9-6 冰淇淋小店 :冰淇淋小店是一种特殊的餐馆。编写一个名为IceCreamStand 的类,让它继承你为完成练习9-1或练习9-4而编写的Restaurant 类。这两个版本的Restaurant 类都可以,挑选你更喜欢的那个即可。添加一个名为flavors 的属性,用于存储一个由各种口味的冰淇淋组成的列表。编写一个显示这些冰淇淋的方法。创建一个IceCreamStand 实例,并调用这个方法。
class Restaurant():
def __init__(self,a,b,c=0):
self.restaurant_name=a
self.cuisine_type=b
self.number_served=c
def describe_restaurant(self):
print("Restaurant_name is "+self.restaurant_name)
print("Cuisine type is "+self.cuisine_type)
def open_restaurant(self):
print("The restaurant is open now")
class IceCreamStand(Restaurant):
def __init__(self,a,b,c=0):
super().__init__(a,b,c)
self.flavors=['banana','apple','orange']
def show_flavors(self):
for flavor in self.flavors:
print(flavor)
IceCream=IceCreamStand("Family","food")
IceCream.show_flavors()
输出:
banana
apple
orange