[Python-ideas] Have dict().update() return its own reference.

[Guido van Rossum]

On Fri, Apr 20, 2012 at 8:00 AM, Alexander Belopolsky
<alexander.belopolsky at gmail.com> wrote:
> On Fri, Apr 20, 2012 at 10:49 AM, Stefan Behnel <stefan_ml at behnel.de> wrote:
>>> >>> a = {}
>>> >>> b = {1:2}
>>> >>> dict(a, **b)
>>> {1: 2}
>>
>> That's no guaranteed behaviour, though. It doesn't work in PyPy, for example.
>
> I seem to recall that CPython had a similar limitation in the past,
> but it was removed at some point.  I will try to dig out the relevant
> discussion, but I think the consensus was that ** should not attempt
> validate the keys.

The should be strings. There is no requirement that they are valid identifiers.

-- 
--Guido van Rossum (python.org/~guido)