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Tue Feb 10 10:33:42 CET 2015 · https://mail.python.org/pipermail/python-dev/2015-February/138120.html

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.

Paul

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