>
> Because
>
> >>> dict(foo=:1)
> File "<string>", line 1
> dict(foo=:1)
> ^
> SyntaxError: invalid syntax
>
I don't see how that's an argument, we are talking about a syntax
extension. Slice builder syntax is only every allowed in a subscript.
Edit my original grammar change proposal to:
```
subscriptlist: ... | kwargsubscript (',' kwargsubscript )* [',']
kwargsubscript: NAME '=' subscript
```
Now slices are allowed in keyword arguments.
-- Caleb Donovick
On Tue, Oct 8, 2019 at 1:09 PM Anders Hovmöller <bo...@killingar.net> wrote:
>
>
> On 8 Oct 2019, at 18:59, Todd <toddr...@gmail.com> wrote:
>
>
>
>
> On Tue, Oct 8, 2019, 12:46 Anders Hovmöller <bo...@killingar.net> wrote:
>
>>
>>
>> On 8 Oct 2019, at 18:35, Todd <toddr...@gmail.com> wrote:
>>
>> On Tue, Oct 8, 2019 at 12:22 PM Andrew Barnert via Python-ideas <
>> python-ideas@python.org> wrote:
>>
>>> On Oct 7, 2019, at 21:21, Caleb Donovick <donov...@cs.stanford.edu>
>>> wrote:
>>> >
>>> > > But what if you wanted to take both positional AND keyword?
>>> >
>>> > I was suggesting that that wouldn't be allowed. So subscript either
>>> has a single argument, a tuple of arguments, or a dictionary of arguments.
>>> Allowing both has some advantages but is less cleanly integratible.
>>>
>>> The problem is that half the examples people conjure up involve both:
>>> using the keywords as options, while using the positional arguments for the
>>> actual indices. Calling the proposal “kwargs in getitem” encourages that
>>> thinking, because that’s the prototypical reason for kwargs in function
>>> calls.
>>>
>>> If there were non-toy examples, so people didn’t have to imagine how it
>>> would be used for themselves, that might be helpful.
>>>
>>>
>> Here is an example modified from the xarray documentation, where you want
>> to assign to a subset of your array:
>>
>> da.isel(space=0, time=slice(None, 2))[...] = spam
>>
>> With this syntax this could be changed to:
>>
>> da[space=0, time=:2] = spam
>>
>>
>> I must have missed something... when did the proposal we're discussing
>> start allowing : there?
>>
>> / Anders
>>
>
> Why wouldn't it?
>
>
> Because
>
> >>> dict(foo=:1)
> File "<string>", line 1
> dict(foo=:1)
> ^
> SyntaxError: invalid syntax
>
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