[Python-Dev] A proposal has surfaced on comp.lang.python toredefine "is"

[Andrew Koenig]

> I'm not sure what the use case for the recursive "is" is, but it would be
> no cheaper than "==" in that case.  I'm disinclined to change things.

I can understand why you might be disinclined, but I do see why recursive
"is" might be cheaper.  The simplest case is probably comparing two
2-element tuples, where the elements are arbitrary objects.  == might not
even be defined on those objects, but "is" would be.