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Fri Sep 9 01:38:03 EDT 2016 · http://mail.python.org/pipermail/python-dev/2016-September/146342.html

On 9 September 2016 at 15:34, Benjamin Peterson <benjamin at python.org> wrote:

> On Thu, Sep 8, 2016, at 22:33, Tim Delaney wrote:
> > On 9 September 2016 at 07:45, Chris Angelico <rosuav at gmail.com> wrote:
> >
> > > On Fri, Sep 9, 2016 at 6:22 AM, Victor Stinner <
> victor.stinner at gmail.com>
> > > wrote:
> > > > A nice "side effect" of compact dict is that the dictionary now
> > > > preserves the insertion order. It means that keyword arguments can
> now
> > > > be iterated by their creation order:
> > > >
> > >
> > > This is pretty sweet! Of course, there are going to be 1172 complaints
> > > from people who's doctests have been broken, same as when hash
> > > randomization came in, but personally, I don't care. Thank you for
> > > landing this!
> > >
> >
> > Are sets also ordered by default now? None of the PEPs appear to mention
> > it.
>
> No.
>

That's an unfortunate inconsistency - I can imagine a lot of people making
the assumption that if dict is ordered (esp. if documented as such) then
sets would be as well. Might need a big red warning in the docs that it's
not the case.

Tim Delaney
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[Python-Dev] Python 3.6 dict becomes compact and gets a private version; and keywords become ordered