code: def log(self, message: str):
          
          dset_log_id = '_%s_log' % self.iid
  
          if dset_log_id not in self.parent.data.keys():
              dset = self.parent.data.create_dataset(
                  dset_log_id, shape=(1,),
                  dtype=np.dtype([
                      ('dt_log', '<i8'),
                      ('message', 'S250')
                  ])
              )
          else:
              dset = self.parent.data[dset_log_id]
  
          timestamp = np.array(
              datetime.now().strftime("%s")
          ).astype('<i8').view('<M8[s]')
  
          dset['dt_log'] = timestamp.view('<i8')
          dset['message'] = message
          self.parent.data.flush()
docs: @deprecated
  
          :param message:
          :return: