def fake_extensionmethod(self):
    print('[custom-extensionmethod] Observer: {}'.format(self))
    source = self

    def subscribe(observer):
        def on_next(x):
            pass
        return source.subscribe(
            on_next, observer.on_error, observer.on_completed)
    return AnonymousObservable(subscribe) 

def handle(self, tran_prop_req, scheduler=None):
        """Execute chaincode instantiation transaction proposal request.

        :param tran_prop_req: chaincode instantiation transaction proposal request
        :param scheduler: see rx.Scheduler, defaults to None
        :return: An rx.Observer wrapper of chaincode instantiation response
        """
        return _instantiate_chaincode(self._chain, tran_prop_req, scheduler) 

def handle(self, tran_prop_req, scheduler=None):
        """Execute chaincode invocation transaction proposal request.

        :param scheduler: see rx.Scheduler (Default value = None)
        :param tran_prop_req: chaincode invocation transaction proposal request
        :return: An rx.Observer wrapper of chaincode invocation response
        """
        return _invoke_chaincode(self._chain, tran_prop_req, scheduler)