docker service update pass options

Hey guys,

I just gave up, I am trying to repeat the following command:

docker service update --config-rm "$OLD_CONFIG"\
 --config-add source="$NEW_CONFIG",target=/usr/local/tomcat/shared/classes/config.cfg,mode=0440\
 busybox_busybox

using Docker SDK for Python doc

...
client = docker.DockerClient(docker_server)
client.configs.create(name=new_config, data=data) - success
svc = client.services.get("busybox_busybox") - success
svc.update(!!!!!!!!!!!!)

and I can't understand how to pass these options "--config-rm abc" and "--config-add"
ps: I was able to create a external config but unable to update service by removing the old one and attaching the one i have created just a line ago

svc.update(image="nginx")
svc.update(command=["sh", "-c", "echo"]) - works fine but now the options I want to use

Start with the linked Service objects documentation and the svc.update entry point. Compare the Docker CLI --config-rm and --config-add operation with the update arguments exposed by the Python SDK, then verify that the service can remove the old config and attach the newly created one.