[Python-Dev] Proposal: go back to enabling DeprecationWarning by default

[Guido van Rossum]

I hadn't seen that, but it requires too much cooperation of library owners.

On Wed, Nov 8, 2017 at 10:56 AM, Barry Warsaw <barry at python.org> wrote:

> On Nov 8, 2017, at 08:47, Guido van Rossum <guido at python.org> wrote:
> >
> > You seem to have missed Nick's posts where he clearly accepts that a
> middle ground is necessary. R D Murray is also still unconvinced. (And
> obviously I myself am against reverting to the behavior from 7 years ago.)
> If we can't agree on some middle ground, the status quo will be maintained.
>
> I haven’t seen a response to my suggestion, so it’s possible that it got
> missed in the flurry.  With coordination with setuptools, we could:
>
> * Re-enable DeprecationWarning by default
> * Add a simplified API for specifically silencing DeprecationWarnings
> * Modify setuptools to call this API for generated entry point scripts
>
> I think this would mean that most application users would still not see
> the warnings.  The simplified API would be available for handcrafted
> scripts to call to accomplish the same thing the setuptools enhancement
> would provide.  Developers would see DeprecationWarnings in their
> development and test environments.
>
> The simplified API would be the equivalent of ignore::DeprecationWarning,
> so with some additional documentation even versions of applications running
> on versions of Python < 3.7 would still have an “out”.  (Yes, the
> simplified API is just a convenience moving forward.)
>
> Cheers,
> -Barry
>
>
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-- 
--Guido van Rossum (python.org/~guido)
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