[Python-Dev] Guarantee ordered dict literals in v3.7?

Make it so. "Dict keeps insertion order" is the ruling. Thanks! On Fri, Dec 15, 2017 at 2:30 AM, INADA Naoki <songofacandy at gmail.com> wrote: > > That's interesting information - I wasn't aware of the different > > performance goals. > > FYI, performance characteristic of my POC implementation of > OrderedDict based on dict order are: > > * 50% less memory usage > * 15% faster creation > * 100% (2x) faster iteration > * 20% slower move_to_end > * 40% slower comparison > > (copied from https://bugs.python.org/issue31265#msg301942 ) > > Comparison is very unoptimized at the moment and I believe it can be > more faster. > On the other hand, I'm not sure about I can optimize move_to_end() more. > > If OrderdDict is recommended to be used for just keeping insertion order, > I feel 1/2 memory usage and 2x faster iteration are more important than > 20% slower move_to_end(). > > But if either "dict keeps insertion order" or "dict keeps insertion order > until > deletion" is language spec, there is no reason to use energy and time for > discussion of OrderedDict implementation. > > Regards, > > INADA Naoki <songofacandy at gmail.com> > _______________________________________________ > Python-Dev mailing list > Python-Dev at python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: https://mail.python.org/mailman/options/python-dev/ > guido%40python.org > -- --Guido van Rossum (python.org/~guido) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-dev/attachments/20171215/094132bf/attachment.html>