各位大佬我想知道一下这串代码有什么问题，从书上抄的不知道为什么提示'Battery' object has no attribute 'describe_battery'
希望帮忙看一下非常感谢

源代码：

class Car():
    """一次模拟汽车的简单测试"""
    def __init__(self,make,model,year):
        """初始化描述汽车的属性"""
        self.make=make
        self.model=model
        self.year=year
        self.odometer_reading=0


    def get_descriptive_name(self):
        """返回整洁的信息"""
        long_name=str(self.year)+''+self.make+''+self.model
        return long_name.title()


    def read_odometer(self):
        """打印一条信息指出汽车总里程"""
        print("this car has"+str(self.odometer_reading)+"miles on it.")


    def update_odometer(self,mileage):
        '''
        将里程表设置为指定的值
        并阻止回调里程表    
        '''
        if mileage >= self.odometer_reading:
            self.odometer_reading=mileage
        else:
            print:("you can't roll back an odometer!")
    def increment_odometer(self,miles):
        self.odometer_reading += miles

class Battery():
    def __init__(self,battary_size=70):
        '''初始化电瓶属性'''
        self.battery=battary_size

class ElectricCar(Car):
    """
    电动汽车的独特之处
    初始化父类的属性，再初始化电动汽车特有的属性
    """

    def __init__(self, make,model,year):
        super().__init__(make,model,year)
        self.battery=Battery()


my_tesla = ElectricCar('tesla','model','2016')

print(my_tesla.get_descriptive_name())
my_tesla.battery.describe_battery()

python英文去停用词，报错 'str' object has no attribute

YWP_2016

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