On Wed, Aug 26, 2020 at 1:41 AM Steven D'Aprano <st...@pearwood.info> wrote:
> On Tue, Aug 25, 2020 at 10:22:20AM -0700, Christopher Barker wrote: > > > This one is easier than most because it's pretty much a do we or don't we > > question, with the spelling semantics, all pretty much already decided. > > Is it to be added to lists, or lists and tuples? How about range > objects? > > range(1, 9, 2).get(100) > > Strings and bytes? > > "abc".get(100) > I think at a minimum it should be in lists and tuples. I can't see any reason not to add it to range, strings, bytes, deque, array, etc. beyond implementation effort. I also think it's fine to leave them out at first. > Do we require 3rd party sequences to add this as well, in order to > continue being called sequences? > I think this is pretty much the same question as the discussion about ABCs. It seems like the answer is "no", or at least "not yet". > > Though I haven't quite seen it said explicitly -- is this proposed to be > > added to the Sequence ABC? > > If so, do we require that it return None as the default, or are types > permitted to return whatever missing value they see fit? > This should be identical to Mapping.get. None isn't required to be the default missing value - callers can specify any value they want - but None is the default default, i.e. `def get(self, item, default=None)`. I don't know of any Mapping or mapping-like class that has a different default default. If such classes exist, then I guess None is just the default default default :)
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