Georg Brandl's IPython extension updated for Python 3 compatibility for Jupyter notebooks.
See http://www.southampton.ac.uk/~fangohr/blog/physical-quantities-numerical-value-with-units-in-python.html for a blog giving examples and usage.
See https://bitbucket.org/birkenfeld/ipython-physics for the general README.txt for physics.py.
A few basics: put this file somewhere in PYTHONPATH. My recommendation for Jupyter is to put it in ~/.ipython . Then, in Jupyter you can do import physics or from physics import Q, or to get the very nice syntactic sugar, use %load_ext physics
Then you can do v = Q(10, "m/s") or, with the load_ext method, simply v = 10 m/s
See the links above for more details, such as converting between units and the sugar for that.
Just to be clear - I added and changed as little as I could get away with, to get it to run in Python 3 and work with Jupyter.
Tested on: Python 3.6.0 |Anaconda 4.3.1 (64-bit)| (default, Dec 23 2016, 12:22:00) [GCC 4.4.7 20120313 (Red Hat 4.4.7-1)]