How could I get self object from python class in robotframework

Question

Engine.py will import several classes as self object

Engine.py

from api import api
from cloud import cloud
class Engine(object):
    def __init__(self, env):
        session = dict()
        self.api = api.API(session)
        self.cloud= cloud.CLOUD(session)

api.py

class API(object):
    def __init__(self, session):
        self.session = session

    def api_keyword(self):
        return SOMETHING

My question is :

How can I use the keyword under api.py and cloud.py and ONLY import Engine.py into robot file

test.robot

*** Settings ***
Library         Engine.py  ${env}


*** Test Cases ***
python class test
    [Tags]    class
    Engine.api.api_keyword

And I got error message:

No keyword with name 'Engine.api.api_keyword' found.

There isn't much you can do at the robot test level. Are you able to change Engine.py? — Bryan Oakley
– Bryan Oakley, Commented Oct 10, 2018 at 22:08
@BryanOakley yes, I can change Engine.py. And I need to let API and XCLOUD share self.session — Bob
– Bob, Commented Oct 11, 2018 at 4:15

Todor Minakov · Accepted Answer · 2019-02-06 06:04:02Z

Robot Framework maps only class methods to keywords; your class Engine does not expose any methods from api and cloud - it probably uses them internally, but doesn't define any as its own.
So here's your first solution - create wrapper methods for all you need in the cases:

def an_api_method(self):
    self.api.something()

And now you'll have the An API Method keyword at your disposal in the cases.

Solution two - make your class inherit the other two:

class Engine(api, cloud):

, and your cases will have access to all their public methods.
This one is more involving - you'll have to call their constructors (with super()), and if you maintain a state in your class, you'll have to accommodate for that. I.e. more drastic code changes are needed.

The third solution doesn't require any changes to the Enhine code - but, disclaimer: I don't know will it work :) (I'm not at a computer).
It consists of two calls - first to use Get Library Instance to get the object of your imported library (from the Builtin library), and then - Call Method:

${ref}=     Get Library Instance    Engine
Call Method     $ref.api    api_keyword

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