Paul Moore wrote:
On Sun, 22 Mar 2020 at 20:01, Steve Jorgensen firstname.lastname@example.org wrote:
Currently, the issubset and issuperset methods of set objects accept arbitrary iterables as arguments. An iterable that is both a subset and superset is, in a sense, "equal" to the set. It would be inappropriate for == to return True for such a comparison, however, since that would break the Hashable contract. Should sets have an additional method, something like like(other), issimilar(other), or isequivalent(other), that returns True for any iterable that contains the all of the items in the set and no items that are not in the set? It would therefore be true in the same cases where <set> = set(other) or <set>.issubset(other) and <set>.issuperset(other) is true. What is the practical use case for this? It seems like it would be a
pretty rare need, at best. Paul
Basically, it is for a sense of completeness. It feels weird that there is a way to check whether an iterable is a subset of a set or a superset of a set but no way to directly ask whether it is equivalent to the set.
Even though the need for it might not be common, I think that the collection of methods makes more sense if a method like this is present.