Python3类之七

###超类###
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) :
        long_name = str(self.year) + " " + self.make + ' ' + self.model
        return long_name.title()
    def read_odometer(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 !")
    def increment_odometer(self,miles) :
        self.odometer_reading += miles
class ElectricCar(Car) :
    '''电动汽车的独特之处'''
    def __init__(self,make,model,year) :
        '''初始化父类的属性'''
        super().__init__(make,model,year)
my_tesla = ElectricCar("tesla","model s",2016)
print (my_tesla.get_descriptive_name())
my_tesla.update_odometer(-1)
my_tesla.read_odometer()
my_tesla.increment_odometer(23)
my_tesla.read_odometer()
#################################
#2016 Tesla Model S
#You can't roll back an odometer !
#This car has 0 miles on it .
#This car has 23 miles on it .
￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥
###超类###如何一个类继承了另外的一个类后
#可以添加区分子类和父类的新的属性和方法
#

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) :
        long_name = str(self.year) + " " + self.make + ' ' + self.model
        return long_name.title()
    def read_odometer(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 !")
    def increment_odometer(self,miles) :
        self.odometer_reading += miles
    def fill_gas_tank(self) :
        print ("You need fill soil to gas tank!!!")
class ElectricCar(Car) :
    '''电动汽车的独特之处'''
    def __init__(self,make,model,year) :
        '''初始化父类的属性'''
        super().__init__(make,model,year)
        self.battery_size = 70
    def describe_battery(self) :
        '''这里打印一条描述电池容量的的消息'''
        print("This car has a " + str(self.battery_size) + "-kWh battery . ")
    def fill_gas_tank(self):
        print ("This car doesn't need a gas tank !!!")
my_tesla = ElectricCar("tesla",'model s',2016)
#print (my_tesla.get_descriptive_name())
#my_tesla.describe_battery()
#重写父类的的方法，可在子类中定义一个和父类中方法同名的方法，这样Python不会考虑这个父类的
#方法，而只关注你在子类的中的方法
my_tesla.fill_gas_tank()
￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥
#This car doesn't need a gas tank !!!
###嵌套类##类的属性太多了##则可以使用嵌套的类

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) :
        long_name = str(self.year) + " " + self.make + ' ' + self.model
        return long_name.title()
    def read_odometer(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 !")
    def increment_odometer(self,miles) :
        self.odometer_reading += miles
    def fill_gas_tank(self) :
        print ("You need fill soil to gas tank!!!")

class Battery():
    """一次模拟电瓶的简单的尝试"""
    def __init__(self,battery_size=70) : 
        self.battery_size = battery_size
    def decribe_battery(self) :
        print ("This car is has a " + str(self.battery_size) + "-kWh battery .")
    
    

class ElectricCar(Car) :
    '''电动汽车的独特之处'''
    def __init__(self,make,model,year) :
        '''初始化父类的属性'''
        super().__init__(make,model,year)
        self.battery = Battery()
my_tesla = ElectricCar("tesla","model s",2017)
print (my_tesla.get_descriptive_name())
my_tesla.battery.decribe_battery()
￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥
#2017 Tesla Model S
#This car is has a 70-kWh battery .