@extensionmethod(Observable, alias="let")
def let_bind(self, func):

    return func(self)
This will be your handler to deal with Canvas requests.
dataset/ETHPy150Open ReactiveX/RxPY/rx/linq/observable/let.py/let_bind--crossover with--dataset/ETHPy150Open benadida/helios-server/helios_auth/auth_systems/facebookclient/webappfb.py/FacebookCanvasHandler.canvas