Paul Moore wrote: > On Sun, 22 Mar 2020 at 20:01, Steve Jorgensen ste...@stevej.name 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. _______________________________________________ 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/MRCHHRVCXEUAB3HBV4WRMZ56O3HUJQYL/ Code of Conduct: http://python.org/psf/codeofconduct/
