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
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