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

[Neil Girdhar]

I believe I have finally finished the work on the patch for PEP 448 (
http://bugs.python.org/issue2292).  How do we get the PEP approved?  What
else would we need to check it into Python?

Best,

Neil

On Tue, Jan 20, 2015 at 12:03 PM, Guido van Rossum <guido at python.org> wrote:

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