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

[Barry Warsaw]

Antoine Pitrou wrote:
> On Mon, 6 Nov 2017 23:23:25 +1000
>> - tweak the default warning filters to turn DeprecationWarning back on
>> for __main__ only
> 
> Thats sounds error-prone.  I'd rather have them on by default
> everywhere.

If DeprecationWarnings were on by default, and setuptools were modified
to silence them in entry point generated mains, and we had a simple API
to easily silence them for manually written mains, wouldn't that handle
the majority of relevant use cases nicely?

-Barry