I got curious and checked: CLU had iterators in 1975.

> Another key feature of the CLU type system are iterators

It also had exception handling and tuple unpacking!

> For instance, writing x,y := y,x would exchange values of x and y

(I'm joking, that's "just" parallel assignment, it just looks like what you do in modern Python with unpacking. And yes, it's all from 1975.)

Details: https://en.wikipedia.org/wiki/CLU_(programming_language)