9.3 继承小结练习

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本文总结了继承的概念，通过IceCreamStand实例展示了如何调用及应用继承的方法，如show_privileges()来显示对象权限，并讨论了get_range()方法在汽车类中的应用，揭示了继承如何影响对象属性的改变。

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9-6 冰淇淋小店：冰淇淋小店是一种特殊的餐馆。编写一个名为 IceCreamStand 的
类，让它继承你为完成练习 9-1 或练习 9-4 而编写的 Restaurant 类。这两个版本的
Restaurant 类都可以，挑选你更喜欢的那个即可。添加一个名为 flavors 的属性，用于
存储一个由各种口味的冰淇淋组成的列表。编写一个显示这些冰淇淋的方法。创建一个

IceCreamStand 实例，并调用这个方法。

class Restruant():

    def __init__(self,restruant_name,cuisine_type,):

        self.restruant_name = restruant_name
        self.cuisine_type = cuisine_type
        self.numbers_served = 0   # jiu can ren shu

    # mian shu can guan xin xi

    def describe_restruant(self):
        print("can guan ming zi: " + self.restruant_name.title() + " , " + self.cuisine_type.title()
            + ", " + str(self.numbers_served) + (" ren tong shi yong can"))

    # ti gong  duo shao ren jiu can

    def set_number_served(self,number_served):
        print("wo men ke yi ti gong " + str(number_served) + " ge zuo wei ")

    # jiu can ren shu di zeng

    def increment_number_served(self,in_num_served):
        self.numbers_served = in_num_served

    # ying ye zhuang tai

    def open_restruant(self):
        print("Zheng zai ying ye")

class IceCreamStand(Restruant):

    def __init__(self,restruant_name,cuisine_type):
        super().__init__(restruant_name,cuisine_type)
        self.flavors = []

    def show_list(self):

        for icecream in self.flavors:
            print(icecream)

ic = IceCreamStand("long feng dian ","zhong guo cai",)
ic.describe_restruant()
ic.flavors = ["cao mei","ping guo","bo luo"]
ic.show_list()

9-7 管理员：管理员是一种特殊的用户。编写一个名为 Admin 的类，让它继承你为
完成练习 9-3 或练习 9-5 而编写的 User 类。添加一个名为 privileges 的属性，用于存
储一个由字符串（如"can add post"、 "can delete post"、 "can ban user"等）组成的
列表。编写一个名为 show_privileges()的方法，它显示管理员的权限。创建一个 Admin

实例，并调用这个方法。

class User():

    def __init__(self,first_name,last_name,age):
        self.first_name = first_name
        self.last_name = last_name
        self.age = age
        self.login_attempts = 0

    def increment_login_attempts(self,x):
        self.login_attempts = x

    def reset_login_attepmts(self,y):
        self.login_attempts = y


    def describe_user(self):
        print("wo de ming zi shi: " + self.first_name.title() + self.last_name.title() + ", wo de nian ling shi " +
              str(self.age) + " sui. " + "ni yi deng lu " + str(self.login_attempts) + " ci")

    def greet_user(self):

        if self.age < 5:
            print("ni shi yi ge xiao hai")

        elif self.age < 16:
            print("ni shi yi ge qing nian")

        else:
            self.age < 25
            print("ni shi yi ge cheng nian")




class Admin(User):

    def __init__(self,first_name,last_name,age):
        super().__init__(first_name,last_name,age)
        self.privileges = ["can add post","can delete post","can add user"]

    def show_privileges(self):
        for privilege in self.privileges:
            print(privilege)


qx = Admin("jim","green","20")
qx.describe_user()
qx.show_privileges()

9-8 权限：编写一个名为 Privileges 的类，它只有一个属性——privileges，其中
存储了练习 9-7 所说的字符串列表。将方法 show_privileges()移到这个类中。在 Admin
类中，将一个 Privileges 实例用作其属性。创建一个 Admin 实例，并使用方法

show_privileges()来显示其权限。

class User():

    def __init__(self,first_name,last_name,age):
        self.first_name = first_name
        self.last_name = last_name
        self.age = age
        self.login_attempts = 0

    def increment_login_attempts(self,x):
        self.login_attempts = x

    def reset_login_attepmts(self,y):
        self.login_attempts = y


    def describe_user(self):
        print("wo de ming zi shi: " + self.first_name.title() + self.last_name.title() + ", wo de nian ling shi " +
              str(self.age) + " sui. " + "ni yi deng lu " + str(self.login_attempts) + " ci")

    def greet_user(self):

        if self.age < 5:
            print("ni shi yi ge xiao hai")

        elif self.age < 16:
            print("ni shi yi ge qing nian")

        else:
            self.age < 25
            print("ni shi yi ge cheng nian")

class Admin(User):

    def __init__(self,first_name,last_name,age):
        super().__init__(first_name,last_name,age)
        self.privileges = Privileges()

class Privileges():
    def __init__(self):
        self.privileges = ["can add post", "can delete post", "can add user"]

    def show_privileges(self):
        for privilege in self.privileges:
            print(privilege)

qx = Admin("Jim","green","30")
qx.describe_user()
qx.privileges.show_privileges()

9-9 电瓶升级：在本节最后一个 electric_car.py 版本中，给 Battery 类添加一个名为
upgrade_battery()的方法。这个方法检查电瓶容量，如果它不是 85，就将它设置为 85。
创建一辆电瓶容量为默认值的电动汽车，调用方法 get_range()，然后对电瓶进行升级，

并再次调用 get_range()。你会看到这辆汽车的续航里程增加了。

class Car():

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

        self.make = make
        self.modle = modle
        self.year = year
        self.odometer_reading = 100

    def get_descriptive_name(self):

        long_name = str(self.year) + " " + self.make + " " + self.modle

        return long_name



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


    def update_odometer(self, mileage):

        if mileage >= self.odometer_reading:

            self.odometer_reading = mileage

        else:

            print("you can't roll back an mile")

    def increment_odometer(self,miles):

        if miles > 0:

            self.odometer_reading += miles

        else:
            print("bu neng wei fu shu")

class Battery():

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

    def describe_size(self):
        print(self.battery_size)

    def upgrade_battery(self):
        if self.battery_size != 85:
            self.battery_size = 85

    def get_range(self):
        if self.battery_size == 70:
            range = 240

        elif self.battery_size == 85:
            range = 270

        message = "zhe liang qi che de xing shi li cheng shi " + str(range)
        message += " gs li"

        print(message)


class ElectricCar(Car):

    """ dian dong qi che de te shu zhi chu """
    def __init__(self,a,b,c):
        """ uu ui hx fu lw de uu xk"""
        super().__init__(a,b,c)
        self.battery = Battery()

my_tesla = ElectricCar("tesla","modles",2016)
print(my_tesla.get_descriptive_name())
my_tesla.battery.get_range()
my_tesla.battery.upgrade_battery()
my_tesla.battery.get_range()