# 导入单个类
from car import Car

my_new_car = Car('audi', 'a4', 2016)
print(my_new_car)
print(my_new_car.get_descriptive_name())
my_new_car.read_odometer()
# 修改属性的值
my_new_car.odometer_reading = 23
my_new_car.read_odometer()