code: def _file_nums_str(self, n_all, n_type, n_ign):
          
          # 'other' is the difference between all and named
          n_oth = n_all - np.sum(n_type)
  
          f_str = "{} Files".format(n_all) + " ("
          if len(n_type):
              f_str += ", ".join("{} {}".format(name, num) for name, num in
                                 zip(self._COUNT_FILE_TYPES, n_type))
              f_str += ", "
          f_str += "other {}; {} ignored)".format(n_oth, n_ign)
          return f_str
docs: Construct a string showing the number of different file types.
  
          Returns
          -------
          f_str : str