greenlet Lightweight in-process concurrent programming (This is the py.magic.greenlet module from the py lib <http://codespeak.net/py/>) The "greenlet" package is a spin-off of Stackless, a version of CPython that supports micro-threads called "tasklets". Tasklets run pseudo-concurrently (typically in a single or a few OS-level threads) and are synchronized with data exchanges on "channels". A "greenlet", on the other hand, is a still more primitive notion of micro-thread with no implicit scheduling; coroutines, in other words. This is useful when you want to control exactly when your code runs. You can build custom scheduled micro-threads on top of greenlet; however, it seems that greenlets are useful on their own as a way to make advanced control flow structures. For example, we can recreate generators; the difference with Python's own generators is that our generators can call nested functions and the nested functions can yield values too. Additionally, you don't need a "yield" keyword. See the example in test_generator.py. Greenlets are provided as a C extension module for the regular unmodified interpreter. http://svn.red-bean.com/bob/greenlet/trunk/#egg=greenlet-dev Bob Ippolito 93f2474659db6f874f0d3e04ed0bfb3f3f3567b7 0.2