'''使用类和实例'''
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):
"""返回整洁的姓名"""
long_name = str(self.year)+ ' '+ self.make + ' ' + self.model
return long_name.title()
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.")
#2用方法修改属性的值
def update_odometer(self,mileage):
"""将里程表数设置为指定的值，禁止将里程表数回调"""
if mileage >= self.odometer_reading:
self.odometer_reading = mileage
else:
print("You can't roll back an odometer!")
#3通过方法对属性值的量进行递增
def increase_odometer(self,miles):
"""将里程表读数增加指定的量"""
self.odometer_reading += miles
my_new_car = Car('audi','a4',2016)
print(my_new_car.get_descriptive_name())
my_new_car.read_odometer()
#直接修改属性的值
my_new_car.odometer_reading = 23
my_new_car.read_odometer()
#2用方法修改属性的值
my_new_car.update_odometer(23)
my_new_car.read_odometer()
#3将里程表读数增加指定的量
my_new_car.increase_odometer(100)
my_new_car.read_odometer()
"""继承"""
class ElectricCar(Car):
"""电动汽车的独特之处"""
def __init__(self,make,model,year):
"""初始化父类的属性"""
super().__init__(make,model,year)
self.battery = Battery()
'''添加一条新属性'''
#self.battery_size = 70
"""添加一个描述battery的方法"""
# def describe_batterry(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.')
# my_tesla = ElectricCar('tesla','model s',2016)
# print(my_tesla.get_descriptive_name())
# my_tesla.describe_batterry()
#重写父类的方法,在子类中添加方法同名父类中的，python首先考虑子类中的
def fill_gas_tank(self):
"""电动汽车没有油箱"""
print("This car doesn't need a gas tank!")
#将实例用做属性
class Battery():
"""一次模拟电动汽车点评的简单尝试"""
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):
"""打印一条信息。 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)
my_tesla = ElectricCar('tesla','model s','2016')
print(my_tesla.get_descriptive_name())
my_tesla.battery.describe_battery()
my_tesla.battery.get_range()
