[Python-Dev] Running Py2.6 with the -3 option

[Guido van Rossum]

On Fri, Jul 11, 2008 at 1:16 PM, Brett Cannon <brett at python.org> wrote:
> No, we should eat our own dog food and transition the code over. If
> anything it will help with code maintenance between 2.x and 3.x.

Agreed. It would be annoying to users trying to clear their own code
of -3 warnings if the stdlib emitted warnings they couldn't easily
suppress.

It should be done with extreme caution though, and preferably on a
case-by-case basis rather than in a sweeping pass. Caution should also
be taken that the changes aren't merged into 3.0 (where presumably
they would conflict with already 3.0-compatible code).

I wonder if it might not be simpler (at least in some cases) to just
disable the warnings for certain modules? I imagine in many cases
fixing up the 2.6 code to suppress -3 warnings would be mere busywork
-- e.g. for code that gets deleted in 3.0 altogether. (Hm, in fact for
such code there's no need to suppress the -3 warnings, as they serve
as a warning to any user of the module that they are using something
that won't survive into 3.0.)

-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)