code: def _flag_file_path(self, status=None):
          
          flag_file_name = "{}_{}".format(
                  self.name, flag_name(status or self.status))
          return pipeline_filepath(self, filename=flag_file_name)
docs: Create path to flag file based on indicated or current status.
  
          Internal variables used are the pipeline name and the designated
          pipeline output folder path.
  
          :param str status: flag file type to create, default to current status
          :return str: path to flag file of indicated or current status.