使用类和实例

class Car():
    """一次模拟汽车的简单尝试"""

    def __init__(self, make, model, year):
        """初始化描述汽车属性"""
        self.make = make
        self.model = model
        self.year = year
        self.odometer_reading = 0

    def get_descriptive_name(self):
        """返回整洁的描述性信息"""
        long_name = str(self.year) + ' ' + self.make + ' ' + self.model
        return long_name.title()

    def update_odometer(self, mileage):
        """
        将里程表读数设置为指定的值
        禁止将里程表读数回调
        """
        if mileage >= self.odometer_reading:
            self.odometer_reading = mileage
        else:
            print("You can't roll back an odometer!")

    def increment_odometer(self, miles):
        """将里程表读数增加指定的量"""
        self.odometer_reading += miles

    def read_odometer(self):
        """
        打印一条指出汽车里程的消息
        """
        print("This car has " + str(self.odometer_reading) + " miles on it.")

my_new_car = Car('subaru', 'outback', 2013)
print(my_new_car.get_descriptive_name())

my_new_car.update_odometer(23500)
my_new_car.read_odometer()

my_new_car.increment_odometer(100)
my_new_car.read_odometer()

2013 Subaru Outback
This car has 23500 miles on it.
This car has 23600 miles on it.