code: def get_default_assets_zip_provider():
    
    path = os.path.join(os.path.dirname(inspect.getfile(sys._getframe(1))),
                        'webfiles.zip')
    if not os.path.exists(path):
      logger.warning('webfiles.zip static assets not found: %s', path)
      return None
    return lambda: open(path, 'rb')
docs: Opens stock TensorBoard web assets collection.
  
    Returns:
      Returns function that returns a newly opened file handle to zip file
      containing static assets for stock TensorBoard, or None if webfiles.zip
      could not be found. The value the callback returns must be closed. The
      paths inside the zip file are considered absolute paths on the web server.