问题
Migrated torando v5.1 to v6. but asynchronous coroutine seems to have removed. Any suggestions for its fix?
Migrating the project from 2.7 to 3.6, at the same time moving tornado framework from v5.1 to v6.0.2 due to the bug suggested in this [Python code for DynamoDB query is working on v3.6 but not working in python 2.7 strackoverflow thread.
After installing v6 tornado it is breaking with below error.
Python3 xxxx.py
Traceback (most recent call last):
File "XXXX.py", line 200, in <module>
class MainHandler(tornado.web.RequestHandler):
File "XXXX.py", line 201, in MainHandler
@tornado.web.asynchronous
AttributeError: module 'tornado.web' has no attribute 'asynchronous'
Come across https://github.com/mher/flower/issues/878 thread facing the same issue. is there a fix for this? or any alternative way of presenting things in code?
回答1:
The @asynchronous
handler was deprecated in 5.1 and removed in 6.0. Instead of using @asynchronous
and callbacks, you should use coroutines (using either @tornado.gen.coroutine
or async def
).
Note that a few older code examples used to have both @asynchronous
and @coroutine
on the same method. Putting @asynchronous
on a coroutine doesn't do anything, so if you happen to be using both decorators you can just remove @asynchronous
without changing anything else.
来源:https://stackoverflow.com/questions/55475879/tornado-v6-seems-to-have-dropped-tornado-web-asynchronous-coroutine-any-differe