code: def load_file(file_path, credentials=None):
    
    if file_path.startswith('gs://'):
      return _load_file_from_gcs(file_path, credentials)
    else:
      return open(file_path, 'r')
docs: Load a file from either local or gcs.
  
    Args:
      file_path: The target file path, which should have the prefix 'gs://' if
                 to be loaded from gcs.
      credentials: Optional credential to be used to load the file from gcs.
  
    Returns:
      A python File object if loading file from local or a StringIO object if
      loading from gcs.