[Python-Dev] Add a developer mode to Python: -X dev command line option (original) (raw)

Antoine Pitrou antoine at python.org
Thu Nov 16 07:43:30 EST 2017

Le 16/11/2017 à 13:38, Victor Stinner a écrit :

2017-11-16 13:09 GMT+01:00 Antoine Pitrou <solipsis at pitrou.net>:

What do you think? Is it ok to include asyncio in the global "developer mode"?

I'd rather not. Those are two orthogonal things. In particular, asyncio debug mode is quite expensive. Is it really an issue? When you develop an application, the performance of the application shouldn't be an issue no?

When you develop an application, you can run functional tests which have timing requirements (or simply be too annoying to run if runtimes are multiplied by 2 or more). In that case it is good to enable "cheap" debug checks (those that have less than a 20% cost) while leaving the expensive ones disabled.

About asyncio debug mode, if it's too expensive to be used to develop an application, maybe there is an issue with additional checks? Should we remove some of them to be able to use asyncio debug mode in more cases?

Well, I'm sure some people like them, otherwise they wouldn't have been added to the codebase in the first place :-) For example, knowing where a Future was created can make debug logs much more informative.

(see https://bugs.python.org/issue31970)

Regards

Antoine.

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