On Mon, Mar 4, 2019 at 1:29 PM Neil Girdhar <mistersh...@gmail.com> wrote:
> On Mon, Mar 4, 2019 at 3:58 PM Christopher Barker <python...@gmail.com> > wrote: > > > > > > > > On Mon, Mar 4, 2019 at 12:41 PM Guido van Rossum <gu...@python.org> > wrote: > >> > >> Honestly I would rather withdraw the subtraction operators than reopen > the discussion about making dict more like set. > > I think that's unfortunate. > > > > > > +1 > > > > I think the "dicts are like more-featured" sets is a math-geek > perspective, and unlikely to make things more clear for the bulk of users. > And may make it less clear. > > I'd say reddit has some pretty "common users", and they're having a > discussion of this right now > ( > https://www.reddit.com/r/Python/comments/ax4zzb/pep_584_add_and_operators_to_the_builtin_dict/ > ). > The most popular comment is how it should be |. > > Anyway, I think that following the mathematical metaphors tends to > make things more intuitive in the long run. Only if you know the mathematical metaphors. ;) > Python is an adventure. > You learn it for years and then it all makes sense. If dict uses +, > yes, new users might find that sooner than |. However, when they > learn set union, I think they will wonder why it's not consistent with > dict union. > Not to me. I barely remember that | is supported for sets, but I sure know about + and lists (and strings, etc.) and I'm willing to bet the vast majority of folks are the some; addition is much more widely known than set theory. > > The PEP's main justification for + is that it matches Counter, but > counter is adding the values whereas | doesn't touch the values. I > think it would be good to at least make a list of pros and cons of > each proposed syntax. > I suspect Steven will add more details to a Rejected Ideas section. > > > We need to be careful -- there are a lot more math geeks on this list > than in the general Python coding population. > > > > Simply adding "+" is a non-critical nice to have, but it seems unlikely > to really confuse anyone. > I agree with Chris. -Brett > > > > -CHB > > > > > > -- > > Christopher Barker, PhD > > > > Python Language Consulting > > - Teaching > > - Scientific Software Development > > - Desktop GUI and Web Development > > - wxPython, numpy, scipy, Cython > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ >
_______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
