code: def last_key(
      self, path: Union[AimObjectKey, AimObjectPath] = ()
  ) -> AimObjectKey:
      return self.tree.last_key(self.absolute_path(path))
  
imports: from aim.ext.transport.message_utils import ResourceObject, pack_args
  from aim.ext.transport.remote_resource import RemoteResourceAutoClean
  from aim.storage.treeview import TreeView
  from aim.storage.treeutils import encode_tree
  from aim.storage.treearrayview import TreeArrayView
  from aim.storage.types import AimObject, AimObjectKey, AimObjectPath
  from typing import TYPE_CHECKING, Any, Iterator, Tuple, Union, List
label_desc: Use image node_id 15 for calling the SubtreeView obj's underlying member method code with example usage: obj.last_key(path) and returns: self