code: def q_sign(self):
          
          if self.reactive_power_mode.lower() == 'inductive':
              return -1
          elif self.reactive_power_mode.lower() == 'capacitive':
              return 1
          else:
              raise ValueError("Unknown value {} in reactive_power_mode".format(
                  self.reactive_power_mode))
docs: Get the sign reactive power based on the
          :attr: `_reactive_power_mode`
  
          Returns
          -------
          :obj: `int` : +1 or -1