On 6 November 2017 at 17:23, Paul G <p...@ganssle.io> wrote: > Is there a major objection to just adding in explicit syntax for > order-preserving dictionaries? To some extent that seems like a reasonable > compromise position in an "explicit is better than implicit" sense. A whole > lot of code is out there that doesn't require or expect order-preserving > dictionaries - it would be nice to be able to differentiate out the parts > where order actually *does* matter. > > (Of course, given that CPython's implementation is order-preserving, a bunch > of code is probably now being written that implicitly requires on this > detail, but at least having syntax that makes that clear would give people > the *option* to make the assumption explicit).
I think the additional syntax have the added benefit of preventing code that relies on the ordering of dict literals to be run on older versions, therefore triggering subtle bugs that had already being mentioned. And also, forgot along the discussion, is the big disadvantage that other Python implementations would have a quite significant overhead on mandatory ordered dicts. One that was mentioned along the way is transpilers, with Brython as an example - but there might be others. MircoPython is far from being the only implementation affected. js -><- > > On 11/06/2017 01:19 PM, Barry Warsaw wrote: >> On Nov 6, 2017, at 02:18, Paul Sokolovsky <pmis...@gmail.com> wrote: >> >>> What it will lead to is further fragmentation of the community. Python2 >>> vs Python3 split is far from being over, and now there're splits >>> between: >>> >>> * people who use "yield from" vs "await" >>> * people who use f-strings vs who don't >>> * people who rely on sorted nature of dict's vs who don't >> >> This is the classic argument of, do you proceed conservatively and use the >> lowest-common denominator that makes your code work with the widest range of >> versions, or do you ride the wave and adopt the latest and greatest features >> as soon as they’re available? >> >> Neither answer is wrong or right… for everyone. It’s also a debate as old >> as the software industry. Every package, project, company, developer, >> community will have to decide for themselves. Once you realize you can’t >> win, you’ve won! :) >> >> -Barry >> >> >> >> _______________________________________________ >> Python-Dev mailing list >> Python-Dev@python.org >> https://mail.python.org/mailman/listinfo/python-dev >> Unsubscribe: >> https://mail.python.org/mailman/options/python-dev/paul%40ganssle.io >> > > > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/jsbueno%40python.org.br > _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
