code: def _export_ext() -> str:
      return "bentodummy"
  
imports: import os
  import sys
  import time
  import typing
  from datetime import datetime
  from typing import TYPE_CHECKING
  import attr
  import fs
  import pytest
  from bentoml import Tag
  from bentoml._internal.store import Store
  from bentoml._internal.store import StoreItem
  from bentoml.exceptions import BentoMLException
  from bentoml.exceptions import NotFound
label_desc: Use image node_id 1 for calling the DummyItem obj's underlying member method code with example usage: obj._export_ext() and returns: str