code: def _bell(self):
          u'''ring the bell if requested.'''
          if self.bell_style == u'none':
              pass
          elif self.bell_style == u'visible':
              raise NotImplementedError(u"Bellstyle visible is not implemented yet.")
          elif self.bell_style == u'audible':
              self.console.bell()
          else:
              raise ReadlineError(u"Bellstyle %s unknown."%self.bell_stylef _bell(self):
          u'''ring the bell if requested.'''
          if self.bell_style == u'none':
              pass
          elif self.bell_style == u'visible':
              raise NotImplementedError(u"Bellstyle visible is not implemented yet.")
          elif self.bell_style == u'audible':
              self.console.bell()
          else:
              raise ReadlineError(u"Bellstyle %s unknown."%self.bell_style)
docs: u'''ring the bell if requested.