On Mon, Mar 4, 2019 at 10:29 PM Serhiy Storchaka <storch...@gmail.com> wrote: > > It is not that I like to add an operator for dict merging, but dicts are > more like sets than sequences: they can not contain duplicated keys and > the size of the result of merging two dicts can be less than the sum of > their sizes. Using "|" looks more natural to me than using "+". We > should look at discussions for using the "|" operator for sets, if the > alternative of using "+" was considered, I think the same arguments for > preferring "|" for sets are applicable now for dicts. >
I concur with Serhiy. While I don't like adding operator to dict, proposed +/- looks similar to set |/- than seq +/-. If we're going to add such set-like operations, operators can be: * dict & dict_or_set * dict - dict_or_set * dict | dict Especially, dict - set can be more useful than proposed dict - dict. > But is merging two dicts a common enough problem that needs introducing > an operator to solve it? I need to merge dicts maybe not more than one > or two times by year, and I am fine with using the update() method. +1. Adding new method to builtin should have a high bar. Adding new operator to builtin should have a higher bar. Adding new syntax should have a highest bar. -- INADA Naoki <songofaca...@gmail.com> _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
