def add_method(self, loop, callback):
f, obj = get_method_vars(callback)<EOL>wrkey = (f, id(obj))<EOL>self[wrkey] = obj<EOL>self.event_loop_map[wrkey] = loop<EOL>
Add a coroutine function

        Args:
            loop: The :class:`event loop <asyncio.BaseEventLoop>` instance
                on which to schedule callbacks
            callback: The :term:`coroutine function` to add