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Tue Feb 10 14:21:08 CET 2015 · http://mail.python.org/pipermail/python-dev/2015-February/138124.html

On Tue, Feb 10, 2015 at 1:33 AM, Paul Moore <p.f.moore at gmail.com> wrote:

> On 10 February 2015 at 00:29, Neil Girdhar <mistersheik at gmail.com> wrote:
> >> > function(**kw_arguments, **more_arguments)
> >> If the key "key1" is in both dictionaries, more_arguments wins, right?
> >
> >
> > There was some debate and it was decided that duplicate keyword arguments
> > would remain an error (for now at least).  If you want to merge the
> > dictionaries with overriding, then you can still do:
> >
> > function(**{**kw_arguments, **more_arguments})
> >
> > because **-unpacking in dicts overrides as you guessed.
>
> Eww. Seriously, function(**{**kw_arguments, **more_arguments}) feels
> more like a Perl "executable line noise" construct than anything I'd
> ever want to see in Python. And taking something that doesn't work and
> saying you can make it work by wrapping **{...} round it just seems
> wrong.
>

+1 to this and similar reasoning

I find the syntax proposed in PEP 448 incredibly obtuse, and I don't think
it's worth it. Python has never placed terseness of expression as its
primary goal, but this is mainly what the PEP is aiming at. -1 on the PEP
for me, at least in its current form.

Eli
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