[Python-Dev] Removing PendingDeprecationWarning

[Brett Cannon]

On Fri, Mar 22, 2019 at 6:19 PM Inada Naoki <songofacandy at gmail.com> wrote:

> On Sat, Mar 23, 2019 at 3:02 AM Brett Cannon <brett at python.org> wrote:
> >
> >>
> >> There might be some small troubles.  But it was small enough for
> >> Python minor versions, I think.
> >
> >
> >  I don't think it's worth the cost to users. We can just choose to stop
> using it in the stdlib and not use PendingDeprecationWarning. And if people
> want to force others to define their own PendingDeprecationWarning by
> deprecating that's fine, but the aliasing where it could cause unintended
> exception swallowing for something related to breaking changes seems
> unnecessarily risky to me simply because we don't want to ask users to
> update their code in a backwards-compatible fashion.
>
> I still can't believe there are real world usage of
> PendingDeprecationWarning
> other than warnings.warn() and assertRaises().
>

I've made the same mistake of assuming something that made no sense to me
wouldn't make sense to anyone else and I have been proven wrong nearly
every time. ;)

-Brett


>
> But I'm OK to not removing actual class.
>
> Stop using it in stdlib reduces maintenance cost like this:
> https://github.com/python/cpython/pull/12494/files
>
> And deprecation in document reduces learning cost.
> People can skip reading and understanding document of
> PendingDeprecatedWarning.
>
> Keeping PendingDeprecationWarning class for several years is very
> low cost compared to these cost.
>
> Regards,
> --
> Inada Naoki  <songofacandy at gmail.com>
>
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