Hi, I'm working for eNovance on the asyncio module, the goal is to use it in the huge OpenStack project (2.5 millions line of code) which currently uses eventlet. I'm trying to fix remaining issues in the asyncio module before Python 3.4 final. The asyncio project is very active but discussions are splitted between its own dedicated mailing list (python-tulip Google group), Tulip bug tracker and Python bug tracker. Please join Tulip mailing list if you are interested to contribute. http://code.google.com/p/tulip/ I would like to share with you the status of the module. Many bugs have been fixed recently. I suppose that new bugs are found because new developers started to play with asyncio since Python 3.4 beta 1. asyncio issues fixed in Python 3.4 beta 3, in a random order: - I wrote most of the asyncio documentation, please help me to improve it! I tried to add many short examples, each time explaining one feature or concept (ex: callbacks, signals, futures, etc.): http://docs.python.org/dev/library/asyncio.html - Characters devices (TTY/PTY) are now supported, useful to control real terminal (not pipes) for subprocesses. On Mac OS X older than Maverick (10.9), the SelectSelector should be used instead of KqueueSelector (kqueue didnd't support character devices) - Tulip #111: StreamReader.readexactly() now raises an IncompleteReadError if the end of stream is reached before we received enough bytes, instead of returning less bytes than requested. - Python #20311: asyncio had a performance issue related to the resolution of selectors and clocks. For example, selectors.EpollSelector has a resolution of 1 millisecond (10^-3), whereas asyncio uses arbitrary timestamps. The issue was fixed by adding a resolution attribute to selectors and a private granularity attribute to asyncio.BaseEventLoop, and use the granularity in asyncio event loop to round times. - New Task.current_task() class method - Guido wrote a web crawler, see examples/crawl.py in Tulip - More symbols are exported in the main asyncio module (ex: Queue, iscouroutine(), etc.) - Charles-François improved the signal handlers: SA_RESTART flag is now set to limit EINTR errors in syscalls - Some optimizations (ex: don't call logger.log() when it's not needed) - Many bugfixes - (sorry if I forgot other changes, see also Tulip history and history of the asyncio module in Python) I also would like to change asyncio to support a "stream-like" API for subprocesses, see Tulip issue #115 (and Python issue #20400): http://code.google.com/p/tulip/issues/detail?id=115 I ported ayncio on Python 2.6 and 2.7, because today OpenStack only uses these Python versions. I created a new project called "Trollius" (instead of "Tulip") because the syntax is a little bit different. "yield from" becomes "yield", and "return x" becomes "raise Return(x)": https://bitbucket.org/enovance/trollius https://pypi.python.org/pypi/trollius If you are interested by the OpenStack part, see my blueprint (something similar to PEPs but for smaller changes) for Oslo Messaing: https://wiki.openstack.org/wiki/Oslo/blueprints/asyncio There is an ongoing effort to port OpenStack to Python 3, eNovance is also working on the portage: https://wiki.openstack.org/wiki/Python3 Victor