bot.py 文件源码

def wait_for_event(self, **event_args):
        # Demented python scope.
        # http://stackoverflow.com/questions/4851463/python-closure-write-to-variable-in-parent-scope
        # This variable could be an object, but instead it's a single-element list.
        event_matched = []

        @gen.coroutine
        def mark_true(event):
            event_matched.append(event)

        log.info('Creating a temporary listener for %s' % (event_args,))
        self.event_listeners.append((event_args, mark_true))

        while not event_matched:
            yield gen.moment

        log.info('Deleting the temporary listener for %s' % (event_args,))
        self.event_listeners.remove((event_args, mark_true))

        raise gen.Return(event_matched[0])