OK, you're it. Please write a PEP for this. On Wed, Feb 27, 2019 at 3:53 PM Steven D'Aprano <[email protected]> wrote:
> On Wed, Feb 27, 2019 at 10:34:43AM -0700, George Castillo wrote: > > > > > > The key conundrum that needs to be solved is what to do for `d1 + d2` > when > > > there are overlapping keys. I propose to make d2 win in this case, > which is > > > what happens in `d1.update(d2)` anyways. If you want it the other way, > > > simply write `d2 + d1`. > > > > > > This would mean that addition, at least in this particular instance, is > not > > a commutative operation. Are there other places in Python where this is > > the case? > > Strings, bytes, lists, tuples. > > In this case, I wouldn't call it dict addition, I would call it a union > operator. That suggests that maybe we match sets and use | for union. > > That also suggests d1 & d2 for the intersection between two dicts, but > which value should win? > > More useful than intersection is, I think, dict subtraction: d1 - d2 > being a new dict with the keys/values from d1 which aren't in d2. > > > > -- > Steven > _______________________________________________ > Python-ideas mailing list > [email protected] > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ > -- --Guido van Rossum (python.org/~guido)
_______________________________________________ Python-ideas mailing list [email protected] https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
