[Python-ideas] Change repr(Ellipsis) to '...'

Now that it is valid in any expressions, I'd argue the repr should reflect the literal syntax. There are however some reasons this might not be desirable: ellipsis is used to represent recursive objects, and by reprlib when summarizing long reprs. Thus there would be ambiguity. A counter-argument may be that a repr isn't intended to be completely unambiguous, reversible or parseable - in deed many objects mimic the literal syntax of builtin types even though they add special behavior. I was going to give os.environ as an example here, and then learned this is no longer the case in Python 3, so maybe it is after all seen as undesirable. :) Anyway: discuss!