Installing ipython, virtualenv, numpy, scipy and all that on Mavericks

After upgrading my iMac to Mavericks I found out that my python environment was totally messed up, notably with ipython and virtualenv crashing at launch. I ended up to use my laptop to keep on with python development until I decided to perform a fresh install of the whole programming environment. I found out a wonderful blog post detailing all the steps needed to organize such an install via homebrew.