[Python-ideas] Flagging blocking functions not to be used with asyncio

[Guido van Rossum]

On Fri, Oct 7, 2016 at 9:52 AM, Yury Selivanov <yselivanov.ml at gmail.com> wrote:
> On 2016-10-07 11:16 AM, Guido van Rossum wrote:
>
>> Maybe a simpler approach would be to write a linter that checks for a
>> known list of common blocking functions, and anything that calls those
>> automatically gets the same property?
>
> What if somebody uses logging module and logs to a file?  I think this is
> something that linters can't infer (how logging is configured).

And depending on your use case this may be acceptable.

> One way to solve this would be to monkeypatch the io and os modules (gevent
> does that, so it's possible) to issue a warning when it's used in an asyncio
> context.  This can be done as a module on PyPI.
>
> Another way would be to add some kind of IO tracing hooks to CPython.

Honestly before writing a lot of code here I'd like to hear more from
Martin about the spread of mistakes he's observed among his users.

-- 
--Guido van Rossum (python.org/~guido)