What about using "finally," which if IIRC is already a thing in Python and encapsulates this idea pretty neatly?
finally blocks are always executed; this kind of else block is only executed if the for block exited normally (i.e. did not throw an exception).
How about a keyword such as "after"? I feel like that could have extensible potential in other areas of the language, and the name makes a little sense logically speaking.