第九章 动手试一试

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。

class Restaurant():
	def __init__(self, restaurant_name, cuisine_type):
		self.restaurant_name = restaurant_name
		self.cuisine_type = cuisine_type
		self.number_served = 0

	def describe_restaurant(self):
		print('''
name : {}
cuisine type : {}
			'''.format(self.restaurant_name, self.cuisine_type))

	def open_retaurant(self):
		print("{} is working.".format(self.restaurant_name.title()))

	def set_number_served(self, number_served):
		self.number_served = number_served

	def increment_number_served(self):
		self.number_served += 1

my_restaurant = Restaurant("喷香炸鸡", "韩国料理")
print(my_restaurant.restaurant_name, my_restaurant.cuisine_type)
my_restaurant.describe_restaurant()
my_restaurant.open_retaurant()

print(my_restaurant.restaurant_name + " has served " 
	  + str(my_restaurant.number_served) + " people.\n"
	)

my_restaurant.set_number_served(8)
print(my_restaurant.restaurant_name + " has served " 
	  + str(my_restaurant.number_served) + " people.\n"
	)

my_restaurant.increment_number_served()
print(my_restaurant.restaurant_name + " has served " 
	  + str(my_restaurant.number_served) + " people.\n"
	)

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 IceCreamStand(Restaurant):
	def __init__(self, restaurant_name, cuisine_type, flavors):
		super().__init__(restaurant_name, cuisine_type)
		self.flavors = flavors

	def show_icesream(self):
		for flavor in self.flavors:
			print(flavor)

flavors = ['Apple', 'Chocolate', 'Milk']
my_IceCreamStand = IceCreamStand('雪糕店', '甜品', flavors)
my_IceCreamStand.show_icesream()

9-14 骰子：请创建一个 Die 类，它包含一个名为 sides 的属性，该属性的默认值为 6。编写一 个名为 roll_die()的方法，它打印位于 1和骰子面数之间的随机数。创建一个 6面的骰 子，再掷 10次。

from random import randint

class Die():
	def __init__(self, sides):
		self.sides = sides

	def roll_die(self):
		x = randint(1, self.sides)
		print("Roll the die, and get side " + str(x) + ".")

my_die = Die(6)
print("Roll a die with 6 sizes.")
for i in range(10):
	my_die.roll_die()

print()
print("Roll a die with 10 sizes.")
my_die = Die(10)
for i in range(20):
	my_die.roll_die()