code: def first_key(
      self, path: Union[AimObjectKey, AimObjectPath] = ()
  ) -> AimObjectKey:
      ...
  
imports: from copy import deepcopy
  from aim.storage.types import CustomObjectBase
  from aim.storage.types import AimObject, AimObjectKey, AimObjectPath
  from aim.storage.treearrayview import TreeArrayView
  from aim.storage.treeview import TreeView
  from typing import Any, Iterator, Tuple, Union
label_desc: Use image node_id 13 for calling the InMemoryTreeView obj's underlying member method code with example usage: obj.first_key(path) without return types