code: def extend(cls, services):
          
          service_names = []
          for service in services:
              service_names.append(_service_name(service))
          services = list(services)
          services.append(cls(reflection_pb2, service_names))
          services.append(ServerReflectionV1Alpha(reflection_pb2_v1alpha,
                                                  service_names))
          return services
docs: Extends services list with reflection service:
  
          .. code-block:: python3
  
              from grpclib.reflection.service import ServerReflection
  
              services = [Greeter()]
              services = ServerReflection.extend(services)
  
              server = Server(services, loop=loop)
              ...
  
          Returns new services list with reflection support added.