code: def refresh(self):
          
  
          output_str = '{platform} {name} {tag} {sat_id}'
          output_str = output_str.format(platform=self._sat.platform,
                                         name=self._sat.name, tag=self._sat.tag, 
                                         sat_id=self._sat.sat_id)
          output_str = " ".join(("pysat is searching for", output_str, "files."))
          output_str = " ".join(output_str.split())
          print (output_str)
          
          info = self._sat._list_rtn(tag=self._sat.tag, sat_id=self._sat.sat_id,
                                     data_path=self.data_path,
                                     format_str=self.file_format)
  
          if not info.empty:
              print('Found {ll:d} of them.'.format(ll=len(info)))
          else:
              estr = "Unable to find any files that match the supplied template. "
              estr += "If you have the necessary files please check pysat "
              estr += "settings and file locations (e.g. pysat.pysat_dir)."
              print(estr)
          info = self._remove_data_dir_path(info)
          self._attach_files(info)
          self._store()
docs: Update list of files, if there are changes.
          
          Calls underlying list_rtn for the particular science instrument.
          Typically, these routines search in the pysat provided path,
          pysat_data_dir/platform/name/tag/,
          where pysat_data_dir is set by pysat.utils.set_data_dir(path=path).