code: def stream(self):
      url = self.get_url()
      if url is None:
          return None
  
      # pylint: disable=consider-using-with
  
      # if our url is actually a local file reference
      # (can happen in local execution mode)
      # then we just open a local file:
      if self._looks_like_local_file(url):
          fileobj = open(url, "rb")
      else:
          fileobj = urlopen(url)
  
      if fileobj:
          try:
              retval = tarfile.open(fileobj=fileobj, mode="r|*")
              return retval
          except BaseException as exc:
              util.check_for_kb_interrupt()
              fileobj.close()
              msg: str = "FAILED to stream artifact {0}: {1}".format(
                  url, exc
              )
              util.report_fatal(msg, self.logger)
      return None
  
imports: import hashlib
  import os
  import re
  import tarfile
  from typing import Dict
  from studio.artifacts import artifacts_tracker
  from studio.util import util, logs
  from studio.credentials import credentials
  from studio.storage import storage_setup
  from studio.storage.storage_type import StorageType
  from studio.storage.storage_handler import StorageHandler
  from studio.storage.storage_handler_factory import StorageHandlerFactory
  from studio.storage.storage_util import tar_artifact, untar_artifact
label_desc: Use image node_id 12 for calling the Artifact obj's underlying member method code with example usage: obj.stream() and returns: None, None, retval