构造函数是

__init__

（注意双下划线），而不是

(note double underscores), not

_init_

除了Carlo发现的错误之外：

- 你不需要声明 name ， hp 和 damage ，因为已经定义了在角色。

- 战斗机和刺客类在 prof 属性之前需要 self 关键字。

In addition to Carlo's well spotted mistake:
- You do not need to declare name, hp and damage in your subclasses, as the are already defined in Character.
- The Fighter and Assassin classes need the self keyword before the prof attribute.