As of this early morning, the flow module has moved from the sandbox into twisted.flow; for those using the sandbox version, simply change: import flow to from twisted.flow import flow The only change was to break flow.py into several chunks flow/base exceptions and abstract base classes flow/stage public stages such as Zip, Merge, Callback, etc. flow/controller controllers, such as Block and Deferred flow/threads threading support and QueryIterator flow/protocol makeProtocol and Protocol However, to make it easy, all of the public classes in the above files have been imported into a 'mega' module: flow/flow.py This is just a file which imports public objects from the other files. On the TODO list includes: 1. Link flow to what ever the next generation Consumer/Producer interfaces are so that flow just slips in. 2. Add more to flow/protocol to support various sorts of filters on protocols (such as an equivalent to LineReader) 3. More documentation (can there ever be enough?) 4. A "C" version, when the time is ripe; this will mostly focus on two functions: Stage.next() and _Iterator._yield() In the next 3 months I won't have much time to throw at this, but I am always open to suggestions and improvements. Extra thank-yous to Etrepum, Itamar, Exarkun, Radix, Glyph, and Pahan. Share and Enjoy! Clark