code: def set_q_df(self, value):
          '''
          setter
          '''
          if isinstance(value, pd.DataFrame) is False and value is not None:
              raise TypeError("The type of `__q_df` must be `pd.DataFrame`.")
          self.__q_df = valuf set_q_df(self, value):
          '''
          setter
          '''
          if isinstance(value, pd.DataFrame) is False and value is not None:
              raise TypeError("The type of `__q_df` must be `pd.DataFrame`.")
          self.__q_df = value
docs: setter