class_docstr: 对于用户使用函数修饰器加入的 callback 函数，使用该 _CallbackWrapper 类为其进行定制，这一个类只保留用户的
  这一个 callback 函数；
class_docstr_tok: ["\u5bf9\u4e8e\u7528\u6237\u4f7f\u7528\u51fd\u6570\u4fee\u9970\u5668\u52a0\u5165\u7684","callback","\u51fd\u6570\uff0c\u4f7f\u7528\u8be5","_CallbackWrapper","\u7c7b\u4e3a\u5176\u8fdb\u884c\u5b9a\u5236\uff0c\u8fd9\u4e00\u4e2a\u7c7b\u53ea\u4fdd\u7559\u7528\u6237\u7684","\u8fd9\u4e00\u4e2a","callback","\u51fd\u6570\uff1b"]
code: def callback_name(self):
      return self.fn.__name__
  
imports: from typing import Callable, Dict, Optional
  from .callback_event import Event, Filter
label_desc: Use image node_id 2 for calling the _CallbackWrapper obj's underlying member method code with example usage: obj.callback_name() and returns: self