"""用于表示汽车的类"""

class Car:
    """模拟汽车尝试"""
    def __init__(self, make, model, year):
        self.make = make
        self.model = model
        self.year = year
        self.odometer_reading = 0

    def get_descriptive_name(self):
        """返回描述"""
        long_name = str(self.year) + ' ' + self.make + ' ' + self.model
        return long_name

    def read_odometer(self):
        """打印行驶里程"""
        print("This car has " + str(self.odometer_reading) + " miles on it.")

    def update_odometer(self, mileage):
        """
        将里程数设为指定的值
        拒绝回拨
        """
        if mileage >= self.odometer_reading:
            self.odometer_reading = mileage
        else:
            print("You can't roll back an odometer!")

    def increment_odometer(self, miles):
        """将里程表读熟增加"""
        self.odometer_reading += miles

class Battery():
    """模拟电车尝试"""
    def __init__(self, battery_size=75):
        self.battery_size = battery_size

    def describe_battery(self):
        print("This car has a " + str(self.battery_size) + " battery.")

    def get_range(self):
        if self.battery_size <= 80:
            range = 300
        elif self.battery_size > 85:
            range = 400

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

class ElectricCar(Car):
    """模拟电动车"""
    def __init__(self, make, model, year):
        """
        初始化父类 再初始化电动车独有的属性
        """
        super().__init__(make, model, year)
        self.battery = Battery()