发布网友 发布时间:2022-05-05 10:40
共2个回答
懂视网 时间:2022-05-10 22:01
错误写法class RemoteHandler(web.RequestHandler): @gen.coroutine def get(self): response = httpclient('http://www.baidu.com') self.write(response.body) @gen.coroutine def httpClient(url): result = yield httpclient.AsyncHTTPClient().fetch(url) return result
按照一般的方法return会报错
需要使用 raise gen.Return(response.body) 代替return
官方例子
@gen.coroutine def fetch_json(url): response = yield AsyncHTTPClient().fetch(url) raise gen.Return(json_decode(response.body))
In Python 3.3, this exception is no longer necessary: the return
statement can be used directly to return a value (previously yield
and return
with a value could not be combined in the same function).
在python 3.3以上版本, 不在需要抛出异常,可以直接使用return直接返回值。而在之前的版本中,yield和带有返回值的return不能处于一个函数当中。
热心网友 时间:2022-05-10 19:09
Tornado安装,环境准备: