class AsyncIncr(tornado.web.RequestHandler):
    client_kwargs = {}

    @tornado.web.asynchronous
    @tornado.gen.engine
    def get(self):
        kk = ('f', 'b', 'z')
        cc = [tornadoredis.Client(**self.client_kwargs) for __ in kk]
        vals = yield [tornado.gen.Task(c.incr, k) for c, k in zip(cc, kk)]
        foo, bar, zar = ['%08d' % v for v in vals]
        self.set_header('Content-Type', 'text/html')
        self.render("template.html", title="Incr benchmark",
                    foo=foo, bar=bar, zar=zar)