Python属性错误"Battery“对象没有"make”属性-继承

Question

我是一个Python新手，在继承学习方面遇到了一些麻烦。我的代码抛出了一个属性错误。

class Battery():
    """A simple attempt to model a battery for an electric car."""
    def __init__(self, battery_size=70):
       """Initialize the battery's attributes."""
       self.battery_size = battery_size

    def describe_battery(self):
        """Print a statement describing the battery size."""
        print("\n" + "This car has a " + str(self.battery_size) + 
        '-kWh battery.')

    def get_range(self):
        """Print a statement about the range based on the battery size."""
        if self.battery_size == 70:
            range = 240
        elif self.battery_size == 85:
            range = 270

    message = self.make + " can go approximately " + str(range)
    message += " miles on a full charge."
    print(message)


class ElectricCar(Car):
    """Represents aspects of a car, specific to electric vehicles."""

    def __init__(self, make, model, year):
        """
        Initialize the attributes of the parent class.
        Then initialize attributes specific to an electric car.
        """
        super().__init__(make.title(), model, year)
        self.battery = Battery()

    def fill_gas_tank(self):
        """Electric cars don't have gas tanks."""
        print(self.make + "'s " + "don't need a gas tank.")

my_tesla = ElectricCar('tesla', 'p90d', '2016')
print(my_tesla.get_descriptive_name())
my_tesla.battery.describe_battery()
my_tesla.battery.get_range()

我已经尝试了编码和属性，但我似乎不能让它运行没有一个错误。任何指导都是非常感谢的。回溯(最近一次调用)：文件"C:\Users\n\Downloads\inheritance.py"，第184行，在my_tesla.battery.get_range()文件"C:\Users\n\Downloads\inheritance.py"，第158行，在get_range消息= self.make +“can go object”+str(范围) AttributeError：'Battery‘对象没有属性'make’

Answer 1

电池中未定义make。您需要将make传递给Battery-class：

class Battery():
    """A simple attempt to model a battery for an electric car."""
    def __init__(self, make, battery_size=70):
       """Initialize the battery's attributes."""
       self.make = make
       self.battery_size = battery_size
    ...

class ElectricCar(Car):
    """Represents aspects of a car, specific to electric vehicles."""

    def __init__(self, make, model, year):
        """
        Initialize the attributes of the parent class.
        Then initialize attributes specific to an electric car.
        """
        super().__init__(make.title(), model, year)
        self.battery = Battery(make.title())

    def fill_gas_tank(self):
        """Electric cars don't have gas tanks."""
        print(self.make + "'s " + "don't need a gas tank.")