Method cb

tornado/test/simple_httpclient_test.py:231–233

(fut, i=i)

            for i in range(4):

                def cb(fut, i=i):
                    seen.append(i)
                    self.stop()

                client.fetch(self.get_url("/trigger")).add_done_callback(cb)
            self.wait(condition=lambda: len(self.triggers) == 2)