WOAH this looks great! I heard it also ships with a compiler that creates binaries which execute blazingly fast. Also love the function composition operator, crazy! I can only imagine how great Python 6 will be. Can't wait!!
I got so lost with the title thinking: "What, is there a python 5 already?" and then you started doing do notation and I was like: "wait a minute", and finally I looked at the post date...