Python屬性錯誤“電池”對象沒有屬性“制造”-繼承

Question

我是Python新手，在繼承學習方面遇到了一些麻煩。 我的代碼拋出屬性錯誤。

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()

我已經嘗試了編碼和屬性，但是似乎無法正確運行它。 任何指導，不勝感激。 追溯（最近一次通話最后一次）：文件“ C：\\ Users \\ n \\ Downloads \\ inheritance.py”，行184，位於my_tesla.battery.get_range（）文件“ C：\\ Users \\ n \\ Downloads \\ inheritance.py” ，第158行，在get_range消息= self.make +“中可以走大約” + str（range）AttributeError：“電池”對象沒有屬性“ make”

Answer 1

品牌未在電池中定義。 您需要將make傳遞給Battery類：

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.")