[Python-Dev] Python 3.6 dict becomes compact and gets a private version; and keywords become ordered (original) (raw)

Tim Delaney timothy.c.delaney at gmail.com
Fri Sep 9 01:38:03 EDT 2016

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.

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