import abc
# 客户端直接实例化SensitiveInfo类可以使用全部方法，为增加安全，将SensitiveInfo定义为抽象基类，不能直接实例化
class SensitiveInfo(metaclass=abc.ABCMeta):
def __init__(self):
self.users = ['nick', 'tom', 'ben', 'mike']
def read(self):
print('There are {} users: {}'.format(len(self.users), self.users))
@abc.abstractmethod
def add(self, user):
self.users.append(user)
print('Add user {}'.format(user))
class Info(SensitiveInfo):
def __init__(self):
super(Info, self).__init__()
self.secret = '31415926' # 将密码放置到文件或数据库中
def add(self, user):
passwd = input('请输入密钥')
super().add(user) if passwd == self.secret else print('passwd is wrong')
if __name__ == '__main__':
info = Info()
info.read()
info.add('jay')
info.read()
输出结果
There are 4 users: ['nick', 'tom', 'ben', 'mike']
请输入密钥31415926
Add user jay
There are 5 users: ['nick', 'tom', 'ben', 'mike', 'jay']
