NumPy is a replacement of Numeric Python that adds the features of numarray.  
To install:

python setup.py install

The setup.py script will take advantage of fast BLAS on your system if it can
find it.  You can help the process with a site.cfg file.

If fast BLAS and LAPACK cannot be found, then a slower default version is used. 

The most current development version is always available from a
subversion repostiory:

http://svn.scipy.org/svn/numpy/trunk