code: def dataset_id(self) -> str:
      if self.__dataset_id is None:
          raise Exception("Must first create a dataset")
      return self.__dataset_id
  
imports: from typing import List, Optional
  import io, pyarrow, requests, sys
  from graphistry.privacy import Mode, Privacy
  from .ArrowFileUploader import ArrowFileUploader
  from .util import setup_logger
label_desc: Use image node_id 5 for calling the ArrowUploader obj's underlying member method code with example usage: obj.dataset_id() and returns: self