class Car:
    '''A simple attempt to simulate a car'''

    def __init__(self,make,model,year):
        '''Initialize the attributes that describe the car'''
        self.make=make
        self.model=model
        self.year=year
        self.odometer_reading=0

    def get_descriptive_name(self):
        '''Return neat descriptive informaiton'''
        long_name=f"{self.year} {self.make} {self.model}"
        return long_name.title()

    def read_odometer(self):
        '''Print a message indicating car mileage'''
        print(f"This car has {self.odometer_reading} miles on it .")

    #使用方法修改属性
    def update_odometer(self,mileage):
        '''
        Set the odometer reading to the specified value
        Do not reverse the odometer reading
        '''
        if mileage>=self.odometer_reading:
           self.odometer_reading=mileage
        else:#此处是禁止将里程表读数往回调
            print("You can't roll back an odometer !")
    
    #通过方法对属性的值进行递增
    def increment_odometer(self,miles):
        '''Increase the odometer reading by a specified amount
           Suppress negative increments
        '''
        if miles>=0:
           self.odometer_reading+=miles
        else:
            print("Error increase !")
    
class Battery:
    '''A simple attempt to simulate electric vehicle battery'''
    def __init__(self,battery_size=75):
        self.battery_size=battery_size

    def describe_battery(self):
        '''Print a message describing the battery capcity'''
        print(f"This car has a {self.battery_size}-kwh battery")

    def get_range(self):
        '''Print a message indicating the battery range'''
        if self.battery_size==75:
            range=20
        elif self.battery_size==100:
            range=315

class ElectricCar(Car):
    '''The uniqueness of the electric car'''
    def __init__(self,make,model,year):
        '''
        Initialize the properties of the parent class
        Reinitialize unique attributes of electric vehicles
        '''
        super().__init__(make,model,year)
        self.battery=Battery()

    print(f"This car can go about {range} miles on a full charge")
        

my_tesla=ElectricCar('tesla','model s',2019)

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