code: def _get_storage_uri_prefix(self):
      # type: () -> str
      if (
          not self._storage_prefix
          or self._task_name != self._task.name
          or self._project_name != self._task.get_project_name()
      ):
          # noinspection PyProtectedMember
          self._storage_prefix = (
              self._task._get_output_destination_suffix()
          )
          self._task_name = self._task.name
          self._project_name = self._task.get_project_name()
      return self._storage_prefix
  
imports: import gzip
  import io
  import json
  import yaml
  import mimetypes
  import os
  import pickle
  from six.moves.urllib.parse import quote
  from copy import deepcopy
  from datetime import datetime
  from multiprocessing.pool import ThreadPool
  from tempfile import mkdtemp, mkstemp
  from threading import Thread
  from time import time
  from zipfile import ZipFile, ZIP_DEFLATED
  import six
  from PIL import Image
  from pathlib2 import Path
  from six.moves.urllib.parse import urlparse
  from typing import Dict, Union, Optional, Any, Sequence, Callable
  from ..backend_api import Session
  from ..backend_api.services import tasks
  from ..backend_interface.metrics.events import UploadEvent
  from ..debugging.log import LoggerRoot
  from ..storage.helper import remote_driver_schemes
  from ..storage.util import sha256sum, format_size, get_common_path
  from ..utilities.process.mp import SafeEvent, ForkSafeRLock
  from ..utilities.proxy_object import LazyEvalWrapper
label_desc: Use image node_id 16 for calling the Artifacts obj's underlying member method code with example usage: obj._get_storage_uri_prefix() and returns: self