Can't Create/Update an replicated service with replicas = 0, bug finded

[niboo-ave]

I try to update a service with the following code:

 service.update(
            name=service.name,
            mode=docker.types.ServiceMode('replicated', replicas=0),
            networks=networks_list,
        )

First, I want to update the replicas only but I have to put name and network or the api think I want to change them (?) then send me an error.
Second, the ServiceMode object created here don't work and looks like this : {'replicated': {}}
The reason for this is https://github.com/docker/docker-py/blob/master/docker/types/services.py#L410 where the if should be an if exist.
I would love to do a pull request but i'm a newbie and I'm already lost with my first one : #1568
Thx for everything

[robkooper]

I added the following code to work around this issue for now:

mode = docker.types.ServiceMode("replicated", int(count))
if int(count) == 0:
    mode.get('replicated')['Replicas'] = 0

[niboo-ave]

Thx, i will use this for now