class_docstr: An mapping operation was requested for an unknown class.
class_docstr_tok: ["An","mapping","operation","was","requested","for","an","unknown","class","."]
code: def __reduce__(self) -> Any:
      return self.__class__, (None, self.args[0])
  
imports: from __future__ import annotations
  from typing import Any
  from typing import Optional
  from typing import Tuple
  from typing import Type
  from typing import TYPE_CHECKING
  from typing import TypeVar
  from ..None import exc
  from ..None import util
  from ..exc import MultipleResultsFound
  from ..exc import NoResultFound
label_desc: Use image node_id 2 for calling the UnmappedClassError obj's underlying member method code with example usage: obj.__reduce__() and returns: self,  None,  self