code: def get_wave_form(self):
          ''' getter '''
          if isinstance(self.__wave_form, WaveFormInterface) is False:
              raise TypeError()
          return self.__wave_forf get_wave_form(self):
          ''' getter '''
          if isinstance(self.__wave_form, WaveFormInterface) is False:
              raise TypeError()
          return self.__wave_form
docs: getter