python之再学习----简单的类(1)

# filename:python2.28.py
# author:super
# date:2018-2-28


class Dog(object):

    def __init__(self, name, age):
        self.name = name
        self.age = age

    def sit(self):
        print(self.name.title() + ' is now sitting')

    def roll_over(self):
        print(self.name.title() + ' rolled over')


class User(object):

    def __init__(self, firstname, lastname):
        self.firstname = firstname
        self.lastname = lastname
        self.login_attempts = 0

    def describe_user(self):
        print("hello , the firstname is " + self.firstname)
        print("hello , the lastname is " + self.lastname)

    def greet_user(self):
        print("hello, " + self.firstname + " " + self.lastname)

    def increment_login_attempts(self):
        self.login_attempts += 1
        return self.login_attempts

    def print_login_attempts(self):
        print(self.login_attempts)

    def reset_login_attempts(self):
        self.login_attempts = 0


dog1 = Dog('aa', 11)
dog1.sit()
dog1.roll_over()

user1 = User('su', 'super')
user1.describe_user()
user1.greet_user()
print(user1.login_attempts)
user1.increment_login_attempts()
user1.print_login_attempts()
user1.reset_login_attempts()
user1.print_login_attempts()


class Car(object):

    def __init__(self, make, model, year):
        self.make = make
        self.model = model
        self.year = year
        self.odometer_reading = 0

    def get_descriptive_name(self):
        long_name = str(self.year) + ' ' + self.make + ' ' + self.model
        return long_name

    def read_odometer(self):
        print("this car have " + str(self.odometer_reading) + "miles")

    def update_odometer(self, mileage):
        self.odometer_reading = mileage

    def increment_odometer(self, miles):
        self.odometer_reading += miles

    def father_function(self):
        print("this is father function")


class ElectricCar(Car):

    def __init__(self, make, model, year):
        super().__init__(make, model, year)
        self.battery_size = Battery()

    def describe_battery(self):
        print("hello, " + self.battery_size() + "good")

    def father_function(self):
        print("son function")


# 定义一个新的类a 可以当成一个类b的一个属性来用，通过b.a.function() 可以调用a的方法
class Battery(object):

    def __init__(self, battery_size=70):
        self.battery_size = battery_size

    def describe_battery(self):
        print("this car's battery is " + str(self.battery_size) + "kwh batter")


my_son_car = ElectricCar('tesla', 'model s', 2016)
print(my_son_car.get_descriptive_name())
# my_son_car.describe_battery()
my_son_car.father_function()
my_son_car.battery_size.describe_battery()