编写类-汽车类

# author:eric zhao
# -*- coding:utf-8 -*-
'一个可用用于表示汽车的类'
class car():
    def __init__(self,make,model,year):
        '初始化描述汽车的属性'
        self.make = make
        self.model = model
        self.year = year
        self.odometer_reading = 10

    def get_descriptive_name(self):
        '返回汽车的描述性名称'
        long_name = str(self.year) + ' ' + self.make + ' '  + self.model
        return long_name.title()

    def read_odometer(self):
        '打印出汽车的里程'
        print('this car has ' + str(self.odometer_reading) + ' miles on it.')

    def update_odometer(self,mileage):
        '将里程表读数设置为指定的值,拒绝将里程表往回拨.'
        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

my_car = car('gm','cadillac',2019)
print(my_car.get_descriptive_name())
my_car.read_odometer()
my_car.update_odometer(15)
my_car.read_odometer()