On Fri, Jul 1, 2011 at 6:01 AM, Ertugrul Soeylemez
I don't know Python very well, but I suspect that its generators are really a sort of coroutines. Iteratees are also coroutines, but their architecture is quite different.
Python generators were originally a sort of heavily restricted coroutine mostly used to implement corecursive sequences, i.e. what we use lazy lists for Haskell. As Python allows arbitrary side-effects, this makes them pretty directly equivalent to using lazy I/O in Haskell. They were later extended to be more like full coroutines, allowing them to both generate and consume data. I imagine that something akin to iteratees could be built on top of the coroutine-style extended generators, but it would likely be more reliant on the programmer not using things incorrectly and the benefit of the whole idea is unclear in this context (for the reasons outlined in the rest of your message). - C.