class Car():
"""一次模拟汽车的简单尝试"""
def __init__(self, make, model, year):
"""初始化描述汽车属性"""
self.make = make
self.model = model
self.year = year
self.odometer_reading = 0
def get_descriptive_name(self):
"""返回整洁的描述性信息"""
long_name = str(self.year) + ' ' + self.make + ' ' + self.model
return long_name.title()
def update_odometer(self, mileage):
"""
将里程表读数设置为指定的值
禁止将里程表读数回调
"""
if mileage >= self.odometer_reading:
self.odometer_reading = mileage
else:
print("You can't roll back an odometer!")
def increment_odometer(self, miles):
"""将里程表读数增加指定的量"""
self.odometer_reading += miles
def read_odometer(self):
"""
打印一条指出汽车里程的消息
"""
print("This car has " + str(self.odometer_reading) + " miles on it.")
class Battery():
"""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)
def upgrade_battery(self):
"""更新电瓶"""
if self.battery_size != 85:
self.battery_size = 85
class ElectricCar(Car):
"""表示汽车的各个方面，特别是电动汽车"""
def __init__(self, make, model, year):
"""初始化父类属性，再初始化电动汽车特有的属性"""
super().__init__(make, model, year) # 让Python调用ElectricCar的父类的方法__init__()
self.battery = Battery()
my_tesla = ElectricCar('tesla', 'model_s', 2016)
print(my_tesla.get_descriptive_name())
my_tesla.battery.describe_battery()
my_tesla.battery.get_range()
my_tesla.battery.upgrade_battery()
my_tesla.battery.get_range()
2016 Tesla Model_S
This car has a 70-kWh battery.
This car can go approximately 240 miles on a full charge.
This car can go approximately 270 miles on a full charge.
