[Python-ideas] Unpacking a dict

[Guido van Rossum]

I am against this. Try something else please. Keep import for modules.

--Guido (mobile)
On May 27, 2016 11:08 AM, "Nikolaus Rath" <Nikolaus at rath.org> wrote:

> On May 27 2016, Ethan Furman <
> ethan-gcWI5d7PMXnvaiG9KC9N7Q at public.gmane.org> wrote:
> > On 05/27/2016 08:09 AM, Nikolaus Rath wrote:
> >> On May 26 2016, Paul Moore wrote:
> >>> On 26 May 2016 at 18:55, Ethan Furman wrote:
> >
> >>>> With the simple syntax that I could live with, a real example could
> be:
> >>>>
> >>>>    {active_id, active_ids, active_model} = context
> >>>>
> >>>> or
> >>>>
> >>>>    {partner_id, product_id, ship_to, product_ids} = values
> >>>
> >>> The behaviour of using the names of the variables from the LHS to
> >>> introspect the value on the RHS is, to me, extremely magical and
> >>> unlike anything I've seen in any other language. I don't think it sits
> >>> well in Python, even though it is certainly a very readable idiom for
> >>> the sort of unpacking we're talking about here.
> >>
> >> Very true. But as someone else already said (I can't find the email
> >> right now), we have a different construct that everyone is familiar with
> >> and that's easily adapted for this situation:
> >>
> >> from dict context import active_id, active_ids, active_model
> >>
> >> or more general:
> >>
> >> "from dict"  <expr> "import" <identifier list>
> >>
> >> Everyone knows that "from .. import .." modifies the local namespace. We
> >> just have to extend it to work not just on modules, but also on
> >> dictionaries.
> >
> > -1
> >
> > import works with modules.
>
> You don't think of it as "*import*ing something from another namespace
> into the local namespace"? That's the first thing that I associate with
> it.
>
> > Having it work with other things would
> > muddy the concept, plus make module/object naming conflicts an even
> > bigger hassle.
>
> You did see that I proposed "from dict <> import ..", instead of "from
> <> import ..", right? The latter would continue to work only for
> modules. The form would be new syntax and only work for dicts.
>
>
> Best,
> -Nikolaus
>
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