[stdlib-sig] standardizing the deprecation policy (and how noisy they are)

[Michael Foord]

Brett Cannon wrote:
> During the moratorium PEP discussions Guido said he wanted to quiet
> down deprecation warnings. I see there being two options on this.
>
> One is to keep things as is, but to require two releases with
> PendingDeprecationWarning so there are three years of
> silent-by-default warnings to update your code. But that last release
> before removal came would still be noisy.
>   

This would be my preferred option. Noisy deprecations are annoying for a
*lot* of users, but are also useful to quite a lot of other users /
developers.

Almost no-one is ever going to run Python with PendingDeprecation
warnings switched on, so there should be at least one 'noisy' release in
my opinion.

All the best,

Michael Foord

> The other option is to simply have all warnings filtered out by
> default. We could alter -W so that when it is used w/o an argument it
> turns to what is currently the default behaviour (or even turn all
> warnings which is more than what happens now). This will require that
> people proactively check for warnings when updating for compatibility,
> else they will eventually use a Python release where there code will
> simply break because something changed. This route means we do not
> have to specify any deprecation policy right now (that would be a
> separate discussion).
>
> Channeling Guido he is after the latter, but a general discussion
> would still be good since he didn't explicitly say what he was after
> other than to quiet down warnings.
>
> -Brett
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