code: def get_entity(self, entity_id, at=None):
          
  
          # Get a snapshot (None if none exist).
          if self._snapshot_strategy is not None:
              snapshot = self._snapshot_strategy.get_snapshot(entity_id, lte=at)
          else:
              snapshot = None
  
          # Decide the initial state of the entity, and the
          # version of the last item applied to the entity.
          if snapshot is None:
              initial_state = None
              gt = None
          else:
              initial_state = entity_from_snapshot(snapshot)
              gt = snapshot.originator_version
  
          # Obtain and return current state.
          return self.get_and_project_events(entity_id, gt=gt, lte=at, initial_state=initial_state)
docs: Returns entity with given ID, optionally until position.