[fyi1183]

Funny, I actually like for-else because it can simplify loop exits.

First of all, the core of a linear search loop always has two exits: the break and the normal (unsuccessful) loop exit.

But in a lookup-or-insert pattern, a regular for loop has two possible states that the system can be in at the end of the loop. With a for-else loop, you can put the or-insert part into the else block, so that there is a simpler invariant: after the loop construct, the element always exists and has been found.

I was honestly surprised by all the negativity in this thread. To offer an alternative opinion, there have been plenty of times when I missed having for-else while writing C.

[gvx]

I feel the same way. For-else is one of those things that make me miss Python when I'm working in another language, alongside things like list/set/dict comprehensions, Python's object model and it's way of dealing with generators and iteration.