code: def __str__(self):
      return f"{self.__class__.__name__}({self.artifact_describe}, index={self.current}>"
  
imports: import logging
  import typing
  from typing import Dict, Generic, List, Optional, Union
  from fate.components.core.essential import Role, Stage
  from .artifacts._base_type import AT, MM, ArtifactDescribe, M, _ArtifactsType, _ArtifactType
label_desc: Use image node_id 5 for calling the WriterGenerator obj's underlying member method code with example usage: obj.__str__() and returns: self, str, self, str, self, str