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.full_name = ''
        self.login_attempts = 0

    def describe_user(self):
        self.full_name = self.first_name.title() + " " + self.last_name.title()
        print(self.full_name)
        print(self.full_name + " is "+str(self.age)+" years old.")

    def greet_users(self):
        print(self.full_name+" nice to meet you!")

    def increment_login_attempts(self):
        for index in range(1, 10):
            self.login_attempts += 1
            print(self.login_attempts)

    def reset_login_attempts(self):
        self.login_attempts = 0


class Privileges:
    def __init__(self, privileges=[]):
        self.privileges = privileges

    def show_privileges(self):
        print("The privileges are shown below:")
        for privilege in self.privileges:
            print(privilege)


class Admin(User):
    def __init__(self, first_name, last_name, age):
        super().__init__(first_name, last_name, age)
        self.gains = Privileges()


user1 = Admin('zhang', 'san', 18)
user1.gains.privileges = ['can add post', 'can delete post', 'can ban user']
user1.gains.show_privileges()