Python #面向对象

 

#-*- coding:utf-8 -*-

class Car(object):
    # 静态字段  通过Car.country来访问.(静态字段属于类)(普通字段属于对象)

    country ＝ '中国'
    def __init__(self,make,model,year):
        # 普通字段 obj.name
        self.make = make
        self.model = model
        self.year = year
        self.odometer_reading =0
        # self.name = '公有字段'
        # self.__foo = "私有字段"


    def display_descriptive_name(self):
        long_name = str(self.year)+ ' ' + self.make + ' ' + self.model
        print  long_name.title()
        return long_name.title()

    def fill_gas_tank(self):
        return "This car need a gas tank!"

    def read_mileage(self):
        print 'This car has ' + str(self.odometer_reading) + ' miles on it'

    def update_odometer(self,mileage):
        if mileage >= self.odometer_reading:
            self.odometer_reading = mileage
        else:
            print "You can't roll back an odometer"

#经典类
# class ElectricCar(Car):
#     def __init__(self,make,model,year):
#         Car.__init__(self,make,model,year)

#新式类
class ElectricCar(Car):
    def __init__(self,make,model,year,battery_model):
        self.battery_model = battery_model
        self.battery_size = 70
        super(ElectricCar,self).__init__(make,model,year)   #继承父类

    def describe_battery(self):     #增加一个子类的方法
        print "This car has a " + str(self.battery_size) + " kwh battery"

    def fill_gas_tank(self):  #类的方法重载,如果跟父类中有重名，子类会调用自己的同名方法
        print 'This car does not need gas tank!'








my_tesla = ElectricCar('tesla','M odel s','2017','松下NCR')
my_tesla.display_descriptive_name()
my_tesla.describe_battery()
my_tesla.fill_gas_tank()



# my_car = Car('audi','a8','2017')
# my_car.display_descriptive_name()
# # print my_car.fill_gas_tank()
# my_car.update_odometer(100)
# my_car.read_mileage()