> On 8 Oct 2019, at 18:59, Todd <[email protected]> wrote:
>
>
>
>
>> On Tue, Oct 8, 2019, 12:46 Anders Hovmöller <[email protected]> wrote:
>>
>>
>>> On 8 Oct 2019, at 18:35, Todd <[email protected]> wrote:
>>>
>>>> On Tue, Oct 8, 2019 at 12:22 PM Andrew Barnert via Python-ideas
>>>> <[email protected]> wrote:
>>>> On Oct 7, 2019, at 21:21, Caleb Donovick <[email protected]> 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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