On Tue, 5 Mar 2019 16:39:40 +0900 INADA Naoki <songofacandy@gmail.com> wrote:
I think some people in favor of PEP 584 just want single expression for merging dicts without in-place update.
But I feel it's abuse of operator overload. I think functions and methods are better than operator unless the operator has good math metaphor, or very frequently used as concatenate strings.
This is why function and methods are better:
* Easy to search. * Name can describe it's behavior better than abused operator. * Simpler lookup behavior. (e.g. subclass and __iadd__)
Then, I propose `dict.merge` method. It is outer-place version of `dict.update`, but accepts multiple dicts. (dict.update() can be updated to accept multiple dicts, but it's not out of scope).
* d = d1.merge(d2) # d = d1.copy(); d.update(d2)
One should also be able to write `d = dict.merge(d1, d2, ...)` If dict merging is important enough to get a new spelling, then I think this proposal is the best: explicit, unambiguous, immediately understandable and easy to remember. Regards Antoine.