新手完全不懂tornado.concurrent.Future

Question

官方例子:

pythonfrom tornado.concurrent import Future

def async_fetch_future(url):
    http_client = AsyncHTTPClient()
    my_future = Future()
    fetch_future = http_client.fetch(url)
    fetch_future.add_done_callback(
        lambda f: my_future.set_result(f.result()))
    return my_future

什么协程,异步迷迷糊糊的!

完全不懂 my_future = Future() 为什么要生成个 Future 对象,最后又返回它！！已经痛苦了几天了！！大神来解救下我吧

Answer 1

你看漏这句了吧

my_future.set_result(f.result())