On Fri, Jul 3, 2020, at 03:57, Wes Turner wrote: > Can a Sequence be infinite? If so, an equality test of two > nonterminating sequences would be a nonterminating operation.
I think not - an infinite sequence would make len, contains, and reversed ill-defined (it also wouldn't allow certain kinds of slices) > Do Sized and *Reversible* imply that a sequence terminates? > Could __len__ return inf? __len__ must return an integer. > Perhaps `Ordered` is a requisite condition for defining a comparator > for Sequences. > `OrderedSequence`? > > Are there unordered Sequences for which a default `__eq__` / `__cmp__` > (et. al) would be wrong or inappropriate? I don't think so [index as a mixin implies being ordered, i think]... the bigger problem is the one I mentioned earlier, that allowing comparison between sequences of different types is inconsistent with tuple and list. _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/LMR7PSLJHSYQFMMWEAW337G3YBXC437U/ Code of Conduct: http://python.org/psf/codeofconduct/
