1、定义一个汽车类

class Car():

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

"""init car edscriptive """

self.make = make

self.model = model

self.year = year

self.odometer_reading = 0

def get_descriptive_name(self):

"""return all descriptive """

long_name = str(self.year) + ' ' + self.make + ' ' + self.model

return long_name.title()

def read_odometer(self):

"""print car drive kelemter information"""

print("This car has " + str (self.odometer_reading) + " miles on it")

def update_odometer_reading(self,mileage):

""" set odometer display value"""

if mileage >= self.odometer_reading:

self.odometer_reading = mileage

else:

print("You cann't roll back an odometer")

def increment_odometer(self,miles):

"""add mileage"""

self.odometer_reading +=miles

my_new_car = Car('audi', 'a4', 2016)

print(my_new_car.get_descriptive_name())

my_new_car.odometer_reading = 23

my_new_car.read_odometer()

my_new_car.update_odometer_reading(60)

my_used_car = Car('subaru', 'outback', '2012')

my_used_car.update_odometer_reading(23500)

my_used_car.read_odometer()

my_used_car.increment_odometer(100)

my_used_car.read_odometer()

运行结果：

2016 Audi A4

This car has 23 miles on it

This car has 23500 miles on it

This car has 23600 miles on it

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2、类的继承：  ElectricalCar 去继承Car   ElectricalCar 具有汽车一般属性

class Car():

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

"""init car edscriptive """

self.make = make

self.model = model

self.year = year

self.odometer_reading = 0

def get_descriptive_name(self):

"""return all descriptive """

long_name = str(self.year) + ' ' + self.make + ' ' + self.model

return long_name.title()

def read_odometer(self):

"""print car drive kelemter information"""

print("This car has " + str (self.odometer_reading) + " miles on it")

def update_odometer_reading(self,mileage):

""" set odometer display value"""

if mileage >= self.odometer_reading:

self.odometer_reading = mileage

else:

print("You cann't roll back an odometer")

def increment_odometer(self,miles):

"""add mileage"""

self.odometer_reading +=miles

class ElectricCar(Car):

"""electirc car special information"""

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

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

self.battery = 70

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

print(my_tesla.get_descriptive_name())

运行结果:

2016 Tesla Model S

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(program exited with code: 0)

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3、将实例用作属性

class Car():

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

"""init car edscriptive """

self.make = make

self.model = model

self.year = year

self.odometer_reading = 0

def get_descriptive_name(self):

"""return all descriptive """

long_name = str(self.year) + ' ' + self.make + ' ' + self.model

return long_name.title()

def read_odometer(self):

"""print car drive kelemter information"""

print("This car has " + str (self.odometer_reading) + " miles on it")

def update_odometer_reading(self,mileage):

""" set odometer display value"""

if mileage >= self.odometer_reading:

self.odometer_reading = mileage

else:

print("You cann't roll back an odometer")

def increment_odometer(self,miles):

"""add mileage"""

self.odometer_reading +=miles

class Battery():

"""once time electirc simple try """

def __init__(self,battery_size=70):

"""init battery information"""

self.battery_size = battery_size

def describe_battery(self):

"""print descriptive battery size information"""

print("This car has " + str(self.battery_size) + "-Kwh battey.")

class ElectricCar(Car):

"""electirc car special whele"""

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

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

self.battery = Battery()

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

print(my_tesla.get_descriptive_name())

my_tesla.battery.describe_battery()

运行结果

2016 Tesla Model S

This car has 70-Kwh battey.

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(program exited with code: 0)

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