On Fri, Oct 23, 2020 at 10:19:07AM +0200, Alex Hall wrote:
> On Fri, Oct 23, 2020 at 5:27 AM Steven D'Aprano <st...@pearwood.info> wrote:
>
> > Background
> > ----------
> >
> > Iterable unpacking assignment:
> >
> > values = (1, 2, 3)
> > a, b, c = *values
> >
> > is a very successful and powerful technique in Python.
> >
>
> Your proposed syntax seems to rest on being similar to this syntax for
> iterable unpacking. But that asterisk isn't valid syntax, so I'm confused.
Oops, you are absolutely right, I confabulated that from the similar
unpacking that does work:
py> [1, 2, *"abc", 3]
[1, 2, 'a', 'b', 'c', 3]
and in function calls. Sorry for the confusion. I swear, no matter how
well I know Python, the moment I don't test something in the REPL, I'm
sure to get it wrong *wink*
> but that doesn't make it make sense to write `... = **values` as you
> suggest.
Iterator unpacking on a dict already works:
py> d = {'a': 10, 'b': 20}
py> spam, eggs = d
py> spam, eggs
('a', 'b')
so we need to distinguish the iterator unpacking case from the dict
unpacking case. To me it makes sense to use the same double star used in
dict unpacking inside dict displays and function calls.
--
Steve
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