On Mon, Nov 12, 2018 at 4:43 PM Nicholas Harrison <nicholasharrison...@gmail.com> wrote: > Only when this is called (implicitly or explicitly) do checks for valid > objects and bounds occur. From my experience using slices, this is how they > work in that context too.
On reconsideration, I've found one more argument in favour of (at least this aspect of?) the proposal: the slice.indices method, which takes a sequence's length and returns an iterable (range) of all indices of such a sequence that would be "selected" by the slice. Not sure if it's supposed to be documented. So there is definitely precedent for "though slices in general are primarily a syntactic construct and new container-like classes can choose any semantics for indexing with them, the semantics specifically in the context of sequences have a bit of a privileged place in the language with concrete expectations, including strictly integer (or None) attributes". _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
