[esfandia]

Python was created in 1991; I imagine the "yield" keyword appeared either right then or not much later!

Also, the refinement at the end of the article: "We arrange an extra function parameter, which is a pointer to a context structure; we declare all our local state, and our coroutine state variable, as elements of that structure." sounds like implementing a closure to me. You make the callee a lambda which would use an outside var/context/state to determine what to do or with what value. Am I understanding this correctly?

[kragen]

your note about closures is correct, yes

as lmm pointed out, python didn't have generators and yield until 2.2. icon, which tim peters adapted the idea from, had them quite a bit earlier than that, but i think it's reasonable to describe icon as not being a commonly used language, then or now

(python's generators are closer syntactically to icon's generators than they are semantically)

[lmm]

> Python was created in 1991; I imagine the "yield" keyword appeared either right then or not much later!

Nope. It was introduced 10 years later, as part of PEP 255, released in Python 2.2.