code: def digital_channel_cable(self, opt1='?', opt2=0):
          
          if opt1 == '?':
              parameter = '?'
          elif self.command['digital_channel_cable_minor'] == '':
              parameter = str(opt1).rjust(4, "0")
          else:
              self._send_command('digital_channel_cable_minor', str(opt1).rjust(3, "0"))
              parameter = str(opt2).rjust(3, "0")
          return self._send_command('digital_channel_cable_major', parameter)
docs: Description:
  
              Change Channel (Digital)
              Pass Channels "XXX.YYY" as TV.digital_channel_cable(XXX, YYY)
  
          Arguments:
              opt1: integer
                  1-999: Major Channel
              opt2: integer (optional)
                  0-999: Minor Channel