On Sat, Sep 26, 2020 at 8:40 PM Steven D'Aprano <steve@pearwood.info> wrote:
On Sat, Sep 26, 2020 at 01:47:56PM -0300, Sebastian Kreft wrote:
In this fashion have you considering having keyword only indices, that is to only allow either obj[1, 2] or obj[row=1, col=2] (if the class supports it), and disallow mixing positional and keyword indices, meaning obj[1, col=2] would be a SyntaxError.
That would severely reduce the usefulness of this feature for me, probably by 80 or 90%, and possibly make it useless for xarray and pandas.
(I don't speak for the pandas or xarray devs, I'm happy to be corrected.)
From my perspective as a developer for both xarray and pandas, both "mixed" and "keyword only" indexing have use cases, but I would guess keyword only indexing is more important. In xarray, we currently have methods that awkwardly approximate keyword only indexing (e.g., xarray.DataArray.sel() and xarray.DataArray.isel() both allow for named dimensions with **kwargs), but nothing for the "mixed" case (neither method supports positional *args).