code: def time_remaining(self, zone):
          
  
          self.update_controller_info()
  
          if zone < 0 or zone > (self.num_relays-1):
              return None
  
          if self.is_zone_running(zone):
              return int(self.running[0]['time_left'])
  
          return 0
docs: Returns the amount of watering time left in seconds.
  
          :param zone: The zone to check.
          :type zone: int
          :returns: If the zone is not running returns 0. If the zone doesn't
                    exist returns None. Otherwise returns number of seconds left
                    in the watering cycle.
          :rtype: None or seconds left in the waterting cycle.