>>> foo = "bar"

>>> eval(repr(foo)) == eval(repr(eval(repr(foo))))

True
>>> eval(repr(None)) == eval(repr(eval(repr(None))))
True

 

Let's change the behavior of the Ellipsis object slightly to have either a .__call__() or .__getitem__() method that returns itself, no matter what argument is passed.

>>> repr(...)

...[Ellipsis]

...(Ellipsis)

I don't know which looks better, but neither look terrible to me.  That would produce a more explanatory repr() while also preserving idempotence.