# 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()
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