(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)
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