[Python-ideas] What's going on with PEP 448 - Additional Unpacking Generalizations ?

[Guido van Rossum]

OK. I don't like arg unpackings after keyword args, for the same reason
plain positional args aren't allowed after keyword args, but I guess I
didn't pay attention when it was introduced, so we're stuck with it now,
it's not the end of the world, and at least the definition is clear
(collect all positional args first, then handle keyword args).

On Tue, Jan 20, 2015 at 8:51 AM, Neil Girdhar <mistersheik at gmail.com> wrote:

>
>
> Okay, so: positional arguments neither follow keyword arguments nor
> keyword argument unpackings; iterable argument unpackings never follow
> keyword argument unpackings.
>
>
>
> On Tue, Jan 20, 2015 at 11:47 AM, Joshua Landau <joshua at landau.ws> wrote:
>
>> On 20 January 2015 at 16:38, Guido van Rossum <guido at python.org> wrote:
>> > The PEP hasn't been accepted yet AFAIK...  I'm generally okay with
>> allowing
>> > multiple *x things (except in an *unpack* position of course) but I
>> still
>> > don't think we should be mixing positional and keyword args. So, no f(a,
>> > b=2, c), nor f(a, b=2, *c).
>> >
>>
>> f(a, b=2, *c) is currently legal as both a call and as a definition:
>>
>>     a, *c = 1, 2, 3
>>
>>     def f(*args, **kwargs):
>>         print(args, kwargs)
>>
>>     f(a, b=2, *c)
>>     #>>> (1, 2, 3) {'b': 2}
>>
>>     def f(a, b=2, *c):
>>         print(a, b, c)
>>
>>     f(1, 2, 3)
>>     #>>> 1 2 (3,)
>>
>> So I imagine that's staying (or, at least, this PEP isn't removing
>> it). I don't think anyone is (yet) arguing for f(a, b=2, c).
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-- 
--Guido van Rossum (python.org/~guido)
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