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Thu Mar 27 16:54:02 CET 2014 · https://mail.python.org/pipermail/python-dev/2014-March/133593.html

BTW, my intention was also to set a precedent for future additions to the
list. "We did this before" is a great argument to help smooth the path,
without bypassing deliberations altogether.
On Mar 27, 2014 2:33 AM, "Nick Coghlan" <ncoghlan at gmail.com> wrote:

> On 27 March 2014 18:02, Stephen J. Turnbull <stephen at xemacs.org> wrote:
> > Alex Gaynor writes:
> >
> >  > Here's my proposed list of such featuers:
> >
> > And suppose that list grows over time?  After all, it once was [].
> >
> > If we go for a feature-by-feature list, that has two more-or-less
> > hidden costs.  (1) Python-Dev has to specify which ones, and either
> > risks a new specification debate in the future, or needs to spend
> > time now describing criteria and processes for extending the list.
>
> It's not a hidden cost - it's a deliberately chosen one. Guido was
> wary of an open-ended agreement, so by enumerating the precise set of
> missing features in Python 2.7 that are causing concern for the
> network security folks, we get to address the immediate problem,
> without granting permission to backport further arbitrary features
> without additional discussion.
>
> > (2) Users may need to worry about the list.  (OTOH, as long as the
> > list is restricted to features in certain modules, users can choose to
> > assume anything in those modules may have changed behavior and that's
> > no different from Nick's proposal for them.)
>
> The PEP already specifically advises that cross-version compatible
> code use feature detection rather than version checks. For network
> security, it's recommended to avoid using the low level modules
> directly, anyway - it's much better to use a higher level library like
> requests, to reduce the number of places where we need to get the
> security design right.
>
> Cheers,
> Nick.
>
> --
> Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
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Python 2.7 network security enhancements