On 17.04.20 23:18, Andrew Barnert via Python-ideas wrote:
On Apr 17, 2020, at 13:39, Alex Hall <alex.moj...@gmail.com> wrote:
I also find the example with :keyword a bit jarring at first glance,
so I propose a double colon to alleviate the problem if we go in
that direction. Compare:
{ :a, "b": x, :c }
{ ::a, "b": x, ::c }
I can see the point of explicitly calling out the syntax like this,
and, while it doesn’t really feel necessary to me, it doesn’t feel at
all onerous either. So if there are people who feel strongly against
the single colon and like the double colon, I’m fine with the double
colon.
(I’m still not sure we need to do anything. And I don’t love extending
dict displays, and think that if we do need a solution, maybe there’s
a better one lurking out there that nobody has hit on. But I
definitely dislike extending dict displays less than extending some
but not other uses of **unpacking, or having a mode switch in the
middle of call syntax, or anything else proposed so far.)
It's been a lot of emails, so I probably missed it, but could you
summarize your objections regarding the idea using `**` as a "mode
switch". That is
func(pos, **, foo, bar)
I think it aligns nicely with the `*` in function definitions. `def
func(a, *, b, c)` or `def func(a, *args, b, c)` means anything following
the `*` part is a keyword-only parameter. Similarly we have today
`func(a, **kwargs, b=b, c=c)`, i.e. anything that follows the `**` part
has to be provided as a keyword argument. Since this eliminates all
ambiguity, why not leave out the parameter names: ` func(a, **kwargs, b,
c)`; and since unpacking is not necessarily required, we could have
`func(a, **, b, c)`.
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