I have found several bugs related to problem above. Also I have working code.

First of all you guys must investigate these problems and take action is this a bug or outdated wiki.

Problems

Example from https://docs.locust.io/en/latest/testing-other-systems.html#sample-xml-rpc-locust-client does not work.
Working code is (important part are commented):

class ApiVehicle(TaskSet):

    def on_start(self):
        # some setup

    def on_stop(self):
        # some clean up

    @task
    def here_goes_my_tasks_for_ApiVehicle(self):
        # some setup

class ApiVehicleUser(HttpLocust):
    task_set = ApiVehicle  # THIS IS MISSING IN DOC, ALSO INNER CLASS CANNOT BE USED CAUSE IT HAS OTHER SCOPE THAN PARENT ONE
    min_wait = 500
    max_wait = 500

    def __init__(self, *args, **kwargs):
        super(ApiVehicleUser, self).__init__(*args, **kwargs)
        self.task_set.ws_client = WebSocketClient(self.host)    # THIS SHOULD GO HERE, NOT IN SUPER CLASS LIKE ON WIKI

class ApiMessage(TaskSet):

    def on_start(self):
        # some setup

    @task
    def here_goes_my_tasks_for_ApiMessage(self):
        # some setup


class ApiMessageUser(HttpLocust):
    task_set = ApiMessage
    min_wait = 500
    max_wait = 500

Wrapper from documentation example class XmlRpcClient(xmlrpclib.ServerProxy): doesn't work.
This wrapper runs somehow the code but doesn't log events.request_failure.fire and events.request_success.fire. In order to have logged requests I had to define simple wrapper like this one:

def locust_wrapper(func, arg, name, endpoint=None):
    start_time = time.time()

    try:
        rsp = func(arg, endpoint)
    except Exception as e:
        print(e)
        total_time = int((time.time() - start_time) * 1000)
        events.request_failure.fire(request_type="WS", name=name, response_time=total_time, exception=e)
    else:
        total_time = int((time.time() - start_time) * 1000)
        events.request_success.fire(request_type="WS", name=name, response_time=total_time, response_length=0)
        return rsp

First of all you guys must investigate these problems and take action

by "you guys", do you mean the small group of unpaid volunteers helping to maintain the project that provided free software for you?

If so, a quicker option would be for you to step up and take action. The documentation is part of the codebase, and I'd be happy to review a Pull Request with your proposed changes.

Yeah, brutally yes, that I meant ;)

So If I will be able to find additional time I will do some update to the docs.

Cheers!

@JaniszM If you name the inlined class task_set - like it is in the documentation - I think it should work.

@heyman Unfortunatelly not. Looks like scope of the inner class in python has nothing to do with super class.

@JaniszM I just tested, and the following code works perfectly fine for me:

from locust import HttpLocust, TaskSet, task

    
class WebsiteUser(HttpLocust):
    host = "http://127.0.0.1:8089"
    min_wait = 2000
    max_wait = 5000
    
    class task_set(TaskSet):
        @task
        def page404(self):
            self.client.get("/does_not_exist")    
        
        @task
        def index(self):
            self.client.get("/")
        
        @task
        def stats(self):
            self.client.get("/stats/requests")        

Thats weird. Maybe this is matter of python version?

Not updated for a long time? Closing this as could not reproduce.