Python3类之二

class Car():
    """一次模拟汽车的简单的尝试"""
    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 = 0
    def get_descriptive(self) :
        '''返回整洁的描述信息'''
        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的消息"""
        print("This car has " + str(self.odometer_reading) + " miles on it .")
my_new_car = Car('Audi',"A4",2018)
print (my_new_car.get_descriptive())
my_new_car.read_odometer()##Python 创建了一个名为odometer_reading的属性，并将其初始值设为0
##在汽车出售时汽车的里程表读数为0的汽车并不多，因此我们需要一个修改该值属性的值得途径
##step 1.直接修改属性的值
my_new_car.odometer_reading = 23
my_new_car.read_odometer()
##step 2.通过方法修改属性的值
class Car():
    """一次模拟汽车的简单的尝试"""
    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 = 0
    def get_descriptive(self) :
        '''返回整洁的描述信息'''
        long_name = str(self.year) + " " + self.make + " " + self.model
        return long_name.title()
    def updated_odometer(self,mileage) :
        self.odometer_reading = mileage####+=mileage###
    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("Audi","A4",2018)
print (my_new_car.get_descriptive())
my_new_car.updated_odometer(26)
my_new_car.read_odometer()