[Python-Dev] [python-committers] Enabling depreciation warnings feature code cutoff

Nick Coghlan ncoghlan at gmail.com
Tue Nov 7 21:57:33 EST 2017

On 8 November 2017 at 11:46, Guido van Rossum <guido at python.org> wrote:
> On Tue, Nov 7, 2017 at 5:35 PM, Nick Coghlan <ncoghlan at gmail.com> wrote:
>> On 8 November 2017 at 10:03, Guido van Rossum <guido at python.org> wrote:
>> > OK, so let's come up with a set of heuristics that does the right thing
>> > for
>> > those cases specifically. I'd say whenever you're executing code from a
>> > zipfile or some such it's not considered your own code (by default).
>> My current preferred heuristic is just to add a new default filter to the
>> list:
>>     once::DeprecationWarning:__main__
>> Which says to warn specifically for the __main__ module, and continue
>> ignoring everything else.
> OK, that sounds great.
>> That way ad hoc scripts and the REPL will get warnings by default,
>> while zipapps and packages can avoid warnings by keeping their
>> __main__.py simple, and importing a CLI helper function from another
>> module. Entry point wrapper scripts will implicitly have the same
>> effect for installed packages.
> That's fine.
>> If folks want to get warnings for other modules as well, then they can
>> either pass "-Wd" to get warnings for everything, or else enable them
>> selectively using the default main module filter as an example.
> Assuming that's how it already works, we're done here. :-)

Cool :)

RFE filed here for that specific change to the default filter set:


P.S. If anyone wants to follow up on some of the other more esoteric
ideas we've discussed in the past few days, they can be separate RFEs.

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

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