code: def _load(self, prev_version=False):
          
  
          fname = self.stored_file_name
          if prev_version:
              fname = os.path.join(self.home_path, 'previous_'+fname)
          else:
              fname = os.path.join(self.home_path, fname)
  
          if os.path.isfile(fname) and (os.path.getsize(fname) > 0):
              if self.write_to_disk:
                  return pds.read_csv(fname, index_col=0, parse_dates=True,
                                      squeeze=True, header=None)
              else:
                  # grab files from memory
                  if prev_version:
                      return self._previous_file_list
                  else:
                      return self._current_file_list
          else:
              return pds.Series([], dtype='a')
docs: Load stored filelist and return as Pandas Series
  
          Parameters
          ----------
          prev_version : boolean
              if True, will load previous version of file list
  
          Returns
          -------
          pandas.Series
              Full path file names are indexed by datetime
              Series is empty if there is no file list to load