创建和使用类

class Dog(): # 类的约定，首字母大写
    """一次模拟小狗的简单尝试"""

    def __init__(self, name, age): # 创建新实例时，自动运行
        """初始化属性name和age"""
        self.name = name
        self.age = age

    def sit(self):
        """模拟小狗被命令时蹲下"""
        print(self.name.title() + " is now sitting.")

    def roll_over(self):
        """模拟小狗被命令时打滚"""
        print(self.name.title() + " roll over!")

my_dog = Dog('willie', 6)

print("My dog's name is " + my_dog.name.title() + ".")
print("My dog is " + str(my_dog.age) + " years old.")
my_dog.sit()
my_dog.roll_over()

My dog's name is Willie.
My dog is 6 years old.
Willie is now sitting.
Willie roll over!

# 9 - 1
class Restaurant():

    def __init__(self, name, type):
        self.name = name
        self.type = type

    def describe_restaurant(self):
        print("The name of the restaurant is: " + self.name.title() + ".")
        print("The type of restaurant is: " + self.type + ".")

    def open_restaurant(self):
        print("The restaurant is open!")

restaurant = Restaurant('打牙祭', 'fast food')
restaurant.describe_restaurant()
restaurant.open_restaurant()

# 9 - 2
class User():

    def __init__(self, first_name, last_name, telephone):
        self.first_name = first_name
        self.last_name = last_name
        self.telephone = telephone

    def describe_user(self):
        print("First name is: " + self.first_name.title())
        print("Last name is: " + self.last_name.title())
        print("Telephone is: " + str(self.telephone))

    def greet_user(self):
        print("Hello, " + self.first_name.title() + self.last_name.title() + "!")

user = User('tao', 'huaxian', 999999999)
user.describe_user()
user.greet_user()

The name of the restaurant is: 打牙祭.
The type of restaurant is: fast food.
The restaurant is open!
First name is: Tao
Last name is: Huaxian
Telephone is: 999999999
Hello, TaoHuaxian!