code: def discrete(cls, name, description=None, unit='', params=None,
                   default=None, initial_status=None):
          
          return cls(cls.DISCRETE, name, description, unit, params,
                     default, initial_status)
docs: Instantiate a new discrete sensor object.
  
          Parameters
          ----------
          name : str
              The name of the sensor.
          description : str
              A short description of the sensor.
          units : str
              The units of the sensor value. May be the empty string
              if there are no applicable units.
          params : [str]
              Sequence of all allowable discrete sensor states
          default : str
              An initial value for the sensor. Defaults to the first item
              of params
          initial_status : int enum or None
              An initial status for the sensor. If None, defaults to
              Sensor.UNKNOWN. `initial_status` must be one of the keys in
              Sensor.STATUSES