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[Python-Dev] Removing PendingDeprecationWarning


On Fri, 22 Mar 2019 at 12:45, Inada Naoki <songofacandy at gmail.com> wrote:
>
> Hi, all.
>
> I'm thinking about removing PendingDeprecationWarning.
> (previous discussion:
> https://discuss.python.org/t/pendingdeprecationwarning-is-really-useful/1038)
>
> It was added "not be printed by default" version of DeprecationWarning.
> But DeprecationWarning is not printed by default now.

No, this was covered in PEP 565, and PendingDeprecationWarning was
explicitly kept as a way of opting out of the revised semantics of
DeprecationWarning.

In Python 3.7 and above, the semantics are:

* PendingDeprecationWarning: never shown by default
* DeprecationWarning: shown by default in the __main__ module
* FutureWarning: shown by default everywhere

PEP section: https://www.python.org/dev/peps/pep-0565/#additional-use-case-for-futurewarning

The documentation was also updated to match:

* https://docs.python.org/3/library/warnings.html#warning-categories
* https://docs.python.org/3/library/exceptions.html#warnings

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia