Proposal: s1.intersects(s2)

[Erik Max Francis]

Steven D'Aprano wrote:

> The problem comes if we (perhaps naively) try to say that if a set A is a
> subset of set B, set A must intersect with B. (Not all intersecting sets
> are subsets, but all subsets are intersecting sets.) Unfortunately that is
> not the same as asking if the intersection between two sets is not empty:

Well, sure.  If you're dealing with empty sets, then you should know 
what you're getting yourself into if you're asking about set 
intersections.  If you don't, then an .intersects method isn't going to 
help you out of your conundrum of not understanding how the null set 
relates to intersections.

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