[Python-Dev] PEP 408 -- Standard library __preview__ package

Antoine Pitrou solipsis at pitrou.net
Sun Jan 29 00:08:37 CET 2012

Le samedi 28 janvier 2012 à 16:03 -0700, Eric Snow a écrit :
> On Sat, Jan 28, 2012 at 3:02 PM, Antoine Pitrou <solipsis at pitrou.net> wrote:
> > There are many reasons to import a module, such as viewing its
> > documentation. And the warning will trigger if the import happens in
> > non-user code, such as a library; or when there is a fallback for the
> > module not being present. People usually get annoyed by intempestive
> > warnings which don't warn about an actual problem.
> As an alternative, how about a __preview__ or __provisional__
> attribute on modules that are in this provisional state?  So just add
> that big warning to the docs, as Guido suggested, and set the
> attribute as a programmatic indicator.  Perhaps also add
> sys.provisional_modules (or wherever) to explicitly give the full list
> for the current Python version.

Well, how often do you examine the attributes of a module before using
it? I think that's a much too obscure way to convey the information.



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