On Sun, Oct 20, 2019 at 6:38 PM Steven D'Aprano <st...@pearwood.info> wrote:
> On Sun, Oct 20, 2019 at 03:06:16PM -0700, Guido van Rossum wrote: > > So the choice is really only three way. > > > > 1) Add d1 + d2 and d1 += d2 (using similarity with list + and +=) > > 2) Add d1 | d2 and d1 |= d2 (similar to set | and |=) > > 3) Do nothing > > Are you saying a method is a non-starter? > > A method won't satisfy those who prefer an operator, but it otherwise > has a number of advantages, and few (that I can see) disadvantages. > It would be like the Judgment of Solomon though. A method is not enough to change the dict API -- I'd rank it below "do nothing". > I think your analysis here: > > > IMO the reason this is such a tough choice is that Python learners are > > typically introduced to list and dict early on, while sets are introduced > > later. > [...] > > So if we want to cater to what most beginners will know, + and += would > be > > the best choice. But if we want to be more future-proof and consistent, | > > and |= are best -- after all dicts are closer to sets (both are hash > > tables) than to lists. (I know you can argue that dicts are closer to > lists > > because both support __getitem__ -- but I find that similarity shallower > > than the hash table nature.) > > is excellent, and I think I shall steal it for the PEP :-) > You're welcome. -- --Guido van Rossum (python.org/~guido) *Pronouns: he/him **(why is my pronoun here?)* <http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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