Question

我通过制作汽车程序从事Python继承工作，但遇到了构建问题。以下是我的代码：

class Car():
    """A simple attempt to represent a car"""
    def __init__(self, make, model, year):
        """Initialize attributes to describe a car."""
        self.make = make
        self.model = model
        self.year = year
        #setting a default value for an attribute#
        self.odometer_reading = 0

    def get_descriptive_name(self):
        """Return a neatly formatted descriptive name."""
        long_name = str(self.year) + ' ' + self.make + ' ' + self.model
        return long_name.title()

    def read_odometer(self):
        """Print a statement showing the car's mileage."""
        print("This car has " +str(self.odometer_reading) + " miles on it.")

    def update_odometer(self, mileage):
        """Modifying the value through the following method 
           Reject the change if it attempts to roll the odometer back 
        """
        if mileage >= self.odometer_reading:
            self.odometer_reading = mileage
        else:
            print("You can't roll back an odometer!")

    def increment_odometer(self, miles):
        """Incremeting an attributes value through methods"""
        self.odometer_reading += miles

class ElectricCar(Car):
    """Represent aspects of a car, specific to electric vehicles."""
    def __init__(self, make, model, year):
        """Initialize attributes of the parent class."""
        super().__init__(make, model, year)

my_tesla = ElectricCar('tesla', 'model s', 2016)
print(my_tesla.get_descriptive_name())

但是，我在尝试运行程序时收到此错误消息：

Traceback (most recent call last):
  File "electric_car.py", line 39, in <module>
    my_tesla = ElectricCar('tesla', 'model s', 2016)
  File "electric_car.py", line 37, in __init__
    super().__init__(make, model, year)
TypeError: super() takes at least 1 argument (0 given)

有什么想法吗？

Answer 1

在python 2.7中，当我改变你的

时

super().__init__(make, model, year)

到

Car.__init__(self, make, model, year)

一切似乎都有效。输出是：

2016特斯拉Model S

Python Car程序中的继承

1 个答案: