python - 如何在子类的 __init__() 中附加另一个参数？

Question

所以基本上我有一个父类，在 init() 中带有一些参数，现在我想定义一个子类，我想在 init() 中重新定义 init()子类只是在其中附加一个新参数。有什么方便的方法可以完成这个吗？

这是我的代码:

class Car(object):
    condition = "new"
    def __init__(self, model, color, mpg):
        self.model = model
        self.color = color
        self.mpg   = mpg

    def display_car(self):
        #print "This is a "+self.color+" "+self.model+" with "+str(self.mpg)+" MPG."
        print self.condition

    def drive_car(self):
        self.condition = "used"

class ElectricCar(Car):
    def __init__(self, model, color, mpg,battery_type):
        self.model = model
        self.color = color
        self.mpg   = mpg
        self.battery_type = battery_type

my_car = Car("DeLorean", "silver", 88)
my_car = ElectricCar("Fuck me","Gold",998,"molten salt")


print my_car.condition
my_car.drive_car()
print my_car.condition

新参数是battery_type

Answer 1

你可以使用super()来访问父类的__init__()并让父类初始化它的属性。示例-

class ElectricCar(Car):
    def __init__(self, model, color, mpg,battery_type):
        super(ElectricCar, self).__init__(model, color, mpg)
        self.battery_type = battery_type