car

#!/usr/bin/env python3
#-*- coding: utf-8 -*-


"""一个可用于表示汽车的类"""
class Car():
    """一次模拟汽车的简单尝试"""

    def __init__(self, make, model, year):
        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 read_odometer(self):
        """打印一条指出汽车里程数的消息"""
        print("This car has " + str(self.odometer_reading) + " miles on it.")

    def update_odometer(self,mileage):
        """将里程表数设置为指定的值
        拒绝将里程数往回拨
        """
        if mileage >=self.odometer_reading:
            self.odometer_reading = mileage
        else:
            print("You can't roll back an odometer!")

    def increment_odometer(self, miles):
        """将里程数增加一定的量"""
        self.odometer_reading += miles