[nailer]

Sure, I mentioned Tornado a few minutes before you posted this. Twisted obviously counts too, I dislike the non-PEP8 coding style it uses but that's off topic. I love Python's non blocking features, they're just not in the mainline VM right now. Here's hoping for a libuv or whatever else non blocking Python 4 VM / stdlib.

[sametmax]

Asyncio has been in the the mainline VM for quite some time.

[nailer]

Yep, the stdlib just needs to use it. In nodeland blocking is the exception: that's not yet the case in Python.