On Thu, 28 Feb 2019 22:43:04 +1100 Steven D'Aprano <st...@pearwood.info> wrote: > On Wed, Feb 27, 2019 at 02:15:53PM -0800, Barry Warsaw wrote: > > > I’m just relaying a data point. Some Python folks I’ve worked with do > > make the connection between dicts and sets, and have questions about > > the ordering guarantees of then (and how they relate). > > Sets and dicts are not related by inheritence (except that they're both > subclasses of ``object``, but so is everything else). They don't share > an implementation. They don't provide the same API. They don't do the > same thing, except in the most general sense that they are both > collections. > > What connection are these folks making?
Some of them may be coming from C++, where the respective characteristics of set and map (or unordered_set and unordered_multimap) are closely related. I'm sure other languages show similar analogies. On a more abstract level, set and dict are both content-addressed collections parametered on hash and equality functions. For algorithmically-minded people it makes sense to see a close connection between them. Regards Antoine. _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
