text: class Humidity(object):
      '''Humidity facade.
         Humidity sensor returns value of humidity.
         With method `enable` you can turn on Humidity sensor and
         'disable' method stops the sensor.
         Use property `tell` to get humidity value.
      '''
  
      @property
      def tell(self):
          '''Current humidity'''
          return self._get_humidity()
  
      def enable(self):
          '''Enable Humidity sensor.'''
          self._enable()
  
      def disable(self):
          '''Disable Humidity sensor.'''
          self._disable()
  
      # private
      def _get_humidity(self, **kwargs):
          raise NotImplementedError()
  
      def _enable(self, **kwargs):
          raise NotImplementedError()
  
      def _disable(self, **kwargs):
          raise NotImplementedError()
  