> On 8 Oct 2019, at 20:07, Todd <toddr...@gmail.com> wrote:
>
>
>
>> On Tue, Oct 8, 2019 at 1:30 PM Anders Hovmöller <bo...@killingar.net> wrote:
>>
>>
>>>> On 8 Oct 2019, at 19:19, Caleb Donovick <donov...@cs.stanford.edu> wrote:
>>>>
>>>
>>>> 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.
>>
>> I wasn't making an argument, I was wondering what exactly we are even
>> discussing. It seems like people are inventing new syntax willy nilly in
>> this thread and I am getting very confused :)
>>
>> / Anders
>>
>
> I thought we were talking about allowing __getitem__ to support keywords. I
> assumed the keywords would use the same syntax as positional values, and
> converting colons to slice objects is part of that syntax. So this isn't new
> syntax, it is just making the positional and keyword syntaxes the same.
I don't see it. Can you give examples of all the variations of slicing and
their keyword equivalent so I understand what you mean? I'll write out the
slicing variants and you can fill in how it would look with keyword arguments:
x[:]
x[a:]
x[-a:]
x[a:b]
x[-a:b]
x[a:-b]
x[-a:-b]
x[:b]
x[:-b]
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