"""一组可用于表示电动汽车的类"""

from python_9_chapter_samples.car import Car

class Battery(object):

"""一次模拟电动汽车电瓶的简单尝试"""

def __init__(self, battery_size=70):

"""初始化电瓶的属性"""

self.battery_size = battery_size

def describe_battery(self):

"""打印一条描述电瓶容量的消息"""

print("This car has a " + str(self.battery_size) + "-kWh battery.")

def get_range(self):

"""打印一条消息，指出电瓶的续航里程"""

if self.battery_size == 70:

range = 240

elif self.battery_size == 85:

range = 270

message = "This car can go approximately " + str(range)

message += " miles on a full charge."

print(message)

class ElectricCar(Car):

"""电动车的独特之处"""

def __init__(self, make, model, year):

"""初始化父类的属性，再初始化电动车特有的属性"""

super().__init__(make, model, year)

self.battery = Battery()

# self.battery_size = 70

# super(ElectricCar, self).__init__(make, model, year) python 2.7必须这样添加实参

def fill_gas_tank(self):

"""电动车没有油箱"""

print("This car does't need a gas tank!")