It's simple and straight forward.
Download and install the MacPorts package for your system here.
On the command line, type the following commands
$ sudo port install pythonYou may aso specify a specific version for python to use, so, type 'python27' and 'py27-scipy' instead. For sure you can use it to download hundreds of other packages, see the list here.
$ sudo port install py-scipy
If you, like me, messed a bit with your system paths, make sure to have a look at your '.bash_profile', or whatever shell you use, to see if any other paths set by brew are taking precedence or something.
There is also 'sudo port selfupdate' to make sure all you packages are up-to-date. Check the guide for other useful commands here.