def show_regroup_history(self):
        """
        Print details of all regrouping operations that been performed on data.
        """
        if not self._regroup_history:
            print('Result has no history.')
        for *_, msg in self.parse_regroup_algo(self._regroup_history):
            print(f'.{msg}')

        Print details of all regrouping operations that been performed on data.
        
stable_whisper/result.py