code: def __call__(self, mapped_object: Any) -> Any:
      obj = self.getter(mapped_object)
      if obj is None:
          state = base.instance_state(mapped_object)
          mp = state.mapper
          if self.attr_name in mp.attrs:
              dict_ = state.dict
              obj = dict_.get(self.attr_name, base.NO_VALUE)
              if obj is None:
                  return _UNMAPPED_AMBIGUOUS_NONE
          else:
              return _UNMAPPED_AMBIGUOUS_NONE
  
      return obj
  
imports: from __future__ import annotations
  import operator
  from typing import Any
  from typing import Callable
  from typing import Dict
  from typing import Generic
  from typing import List
  from typing import Optional
  from typing import Sequence
  from typing import Tuple
  from typing import Type
  from typing import TYPE_CHECKING
  from typing import TypeVar
  from typing import Union
  from .None import base
  from .collections import collection
  from .collections import collection_adapter
  from ..None import exc
  from ..None import util
  from ..sql import coercions
  from ..sql import expression
  from ..sql import roles
  from ..util.typing import Literal
label_desc: Use image node_id 2 for calling the _AttrGetter obj's underlying member method code with example usage: obj.__call__(mapped_object) and returns: obj, _UNMAPPED_AMBIGUOUS_NONE, _UNMAPPED_AMBIGUOUS_NONE