class Account:
    # 普通属性    bank = "BOC"    # 内部属性    _username = "Hogwarts"    # 私有属性    __password = "888"

# 通过类名访问类属性print(Account.bank)  # 将会打印 BOCprint(Account._username)  # 将会打印 Hogwartsprint(Account.__password)  # 将会引发 AttributeError
print(Account.__dict__)
# 实例化obj = Account()
# 实例访问类属性print(obj.bank)  # 将会打印 BOCprint(obj._username)  # 将会打印 Hogwartsprint(obj.__username)  # 将会引发AttributeError

class Account:    # 普通属性    bank = "BOC"    # 内部属性    _username = "Hogwarts"    # 私有属性    __password = "888"
    @property    def password(self):        return self.__password
# 实例化对象obj = Account()
# 访问实例的私有属性print(obj.password)  # 将会打印 888

class Account:    # 普通属性    bank = "BOC"    # 内部属性    _username = "Hogwarts"    # 私有属性    __password = "888"
    @property    def password(self):        return self.__password
    @password.setter    def password(self, value):        # 增加数据的校验        if len(value) >= 8:            self.__password = value        else:            print("密码长度最少要有8位！")

# 实例化对象obj = Account()
# 修改私有属性（满足校验条件）obj.password = "hogwarts666"  # 修改成功print(obj.password)  # 将会打印 hogwarts666
# 修改私有属性（不满足校验条件）obj.password = "123"  # 修改不会生效print(obj.password)  # 将会打印 888