python 从入门到实践 9-8的练习题：
class User():
def __init__(self, first_name, last_name):
self.first_name = first_name
self.last_name = last_name
self.sex = 'man'
self.tall = ''
self.login_attempts = 0
def increment_login_attempts(self):
self.login_attempts += 1
def reset_login_attempts(self):
self.login_attempts = 0 #
def describe_user(self):
if self.tall:
man = f'first_name: {self.first_name.title()} last_name: {self.last_name.title()} Sex: {self.sex.title()} Tall: {self.tall.upper()}'
print(man)
else:
woman = f'first_name: {self.first_name.title()}last_name: {self.last_name.title()}Sex: {self.sex.title()}'
print(woman)
def greet_user(self):
if self.sex == 'man':
print(f'Hello Mr. {self.first_name.title()} {self.last_name.title()}.\n\t Welcom to the python.')
else:
print(f'Hello Mis. {self.first_name.title()} {self.last_name.title()}.\n\t Welcom to the python.')
"""创建新类，继承上类"""
class Admin(User):
"""管理员权限说明"""
def __init__(self, first_name, last_name):
"""初始化父类属性"""
super().__init__(first_name, last_name)
self.privileges = Privileges()
class Privileges():
def __init__(self):
self.privileges = []
def show_privileges(self):
show = f'You have {self.privileges}.'
print(show)
a = Admin('liu', 'rui')
a.sex = 'woman'
**a.privileges.privileges = ['can Add post', 'can delete post', 'can ban user'] **
**a.privileges.show_privileges()**
标注行为什么更改为：
Privileges.privileges = ['can Add post', 'can delete post', 'can ban user']
Privileges.show_privileges()
就错误呢？定义的Privileges类也没有继承Admin啊？
Privileges是类名
privileges是实例变量
类名用实例变量是不可以的，类名要用类变量
如
class Privileges():
test = '你好'
def __init__(self):
self.privileges = []
Privileges.test = "我好"
def show_privileges(self):
show = f'You have {self.privileges}.'
print(show)
print(Privileges.test)
虽然不是我想要的，但又多了一个知识。
已经自己研究明白了。
感谢