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 Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
