On Thu, Feb 12, 2015 at 5:43 AM, Steven D'Aprano <steve@pearwood.info> wrote:

A very strong -1 on the proposal. We already have a perfectly good way
to spell dict += , namely dict.update. As for dict + on its own, we have
a way to spell that too: exactly as you write above.

Another strong -1 from me. In my view, the only operation on dictionaries that would deserve to be denoted + would be counter or sparse array addition, but we already have collections.Counter and writing a sparse array (as in sa(a=1,c=-2) + sa(a=1,b=1,c=1) == sa(a=2,b=1,c=-1)) is a simple exercise.