Hi all,

I was wondering on whether there is any interest in introducing a "plus-minus" 
operator:

Conceptually very simple; instead of:

        upper, lower = a + b, a - b

use instead:

        upper, lower = a +- b

In recent projects I've been working on, I've been having to do the above "plus 
minus" a lot, and so it would simplify/clean-up/reduce error potential cases 
where I'm writing the results explicitly.

It isn't a big thing, but seems like a clean solution, that also takes 
advantage of python's inherent ability to return and assign tuples.
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