code: def _remove_monitor(monitors, handle, devices, events):
      
  
      empty_devices = []
  
      for conn_string in devices:
          data = monitors.get(conn_string)
          if data is None:
              continue
  
          for event in events:
              event_dict = data.get(event)
              if event_dict is None:
                  continue
  
              if handle in event_dict:
                  del event_dict[handle]
  
              if len(event_dict) == 0:
                  del data[event]
  
          if len(data) == 0:
              empty_devices.append(conn_string)
  
      return empty_devices
docs: Remove the given monitor from the listed devices and events.