INADA Naoki asked Rémi Lapeyre in https://bugs.python.org/issue33462 to start a discussion on python-dev.
Victor 2018-05-25 17:48 GMT+02:00 Guido van Rossum <gu...@python.org>: > (Also this probably belongs in python-ideas, unless there's already a > bugs.python.org issue for it -- but you didn't mention that so I assume it's > just an idea? How did you reach the line count estimates?) > > On Fri, May 25, 2018 at 8:46 AM, Guido van Rossum <gu...@python.org> wrote: >> >> Please go find some real world code that would benefit from this. Don't >> make up examples, just show some code in a repository (public if possible, >> but private is okay, as long as you can quote small amounts of code from it) >> where te existence of reverse iteration over a dict would have been helpful. >> >> On Thu, May 24, 2018 at 5:55 AM, Rémi Lapeyre <remi.lape...@vint.fr> >> wrote: >>> >>> >>> Hi, >>> >>> since dict keys are sorted by their insertion order since Python 3.6 and >>> that >>> it’s part of Python specs since 3.7 a proposal has been made in bpo-33462 >>> to >>> add the __reversed__ method to dict and dict views. >>> >>> Concerns have been raised in the comments that this feature may add too >>> much >>> bloat in the core interpreter and be harmful for other Python >>> implementations. >>> >>> Given the different issues this change creates, I see three >>> possibilities: >>> >>> 1. Accept the proposal has it is for dict and dict views, this would add >>> about >>> 300 lines and three new types in dictobject.c >>> >>> 2. Accept the proposal only for dict, this would add about 80 lines and >>> one >>> new type in dictobject.c while still being useful for some use cases >>> >>> 3. Drop the proposal as the whole, while having some use, >>> reversed(dict(a=1, b=2)) >>> may not be very common and could be done using OrderedDict instead. >>> >>> What’s your stance on the issue ? >>> >>> Best regards, >>> Rémi Lapeyre >>> _______________________________________________ >>> 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/guido%40python.org >> >> >> >> >> -- >> --Guido van Rossum (python.org/~guido) > > > > > -- > --Guido van Rossum (python.org/~guido) > > _______________________________________________ > 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/vstinner%40redhat.com > _______________________________________________ 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
