I wrote the Python CBOR implementation you get if you `pip install cbor`. Source project here: https://bitbucket.org/bodhisnarkva/cbor
It's getting pretty extensive use at a few places I know, so I hope it's good enough!
Good to know! I'll try it as soon as it supports Python 3.5, which I use on a couple of machines. The issues page tells me that you're working on that already.