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

MRAB python at mrabarnett.plus.com
Tue Nov 7 16:53:54 EST 2017

On 2017-11-07 14:17, Philipp A. wrote:
> Nick Coghlan <ncoghlan at gmail.com <mailto:ncoghlan at gmail.com>> schrieb am 
> Di., 7. Nov. 2017 um 14:57 Uhr:
>     Users of applications written in Python are not python-dev's users:
>     they're the users of those applications, and hence the quality of
>     that experience is up to the developers of those applications. […]
> Thank you, that’s exactly what I’m talking about. Besides: Nobody is 
> “hosed”… There will be one occurrence of every DeprecationWarning in the 
> stderr of the application. Hardly the end of the world for CLI 
> applications and even invisible for GUI applications.
> If the devs care about the user not seeing any warnings in their CLI 
> application, they’ll have a test set up for that, which will tell them 
> that the newest python-dev would raise a new warning, once they turn on 
> testing for that release. That’s completely fine!
> Explicit is better than implicit! If I know lib X raises 
> DeprecationWarnings I don’t care about, I want to explicitly silence 
> them, instead of missing out on all the valuable information in other 
> DeprecationWarnings.
Also, errors should never pass silently. Deprecation warnings are future 

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