gistfile1.py

class BaseHandler(tornado.web.RequestHandler):

    # ...

    @tornado.gen.coroutine
    def verify_place_something(self):

        motor_db = self.settings['motor_db']

        cursor = motor_db.places.find(
            # ...            
            limit = 1,
        )

        while (yield cursor.fetch_next):
            geolocation = cursor.next_object()
            raise tornado.gen.Return(geolocation)

class MainHandler(BaseHandler):

    @tornado.web.asynchronous
    @tornado.gen.coroutine
    def get(self):

        geolocation = (yield self.verify_place_something())

        self.render('index.html')