code: def _load_submissions_from_datastore_dir(self, dir_suffix, id_pattern):
      
      submissions = self._storage_client.list_blobs(
          prefix=os.path.join(self._round_name, dir_suffix))
      return {
          id_pattern.format(idx): SubmissionDescriptor(
              path=s, participant_id=participant_from_submission_path(s))
          for idx, s in enumerate(submissions)
      }
docs: Loads list of submissions from the directory.
  
      Args:
        dir_suffix: suffix of the directory where submissions are stored,
          one of the folowing constants: ATTACK_SUBDIR, TARGETED_ATTACK_SUBDIR
          or DEFENSE_SUBDIR.
        id_pattern: pattern which is used to generate (internal) IDs
          for submissins. One of the following constants: ATTACK_ID_PATTERN,
          TARGETED_ATTACK_ID_PATTERN or DEFENSE_ID_PATTERN.
  
      Returns:
        dictionary with all found submissions