I recommend the Enthought Python Distribution, available [here][1]. From the EPD homepage:

*The Enthought Python Distribution provides scientists with a comprehensive set of tools to perform rigorous data analysis and visualization. Python, distinguished by its flexibility, coherence, and ease-of-use, is rapidly becoming the programming language of choice for researchers worldwide. EPD extends this capacity with a powerful collection of Python libraries to enable interactive technical computing and cross-platform rapid application development.*

There are free academic versions (Windows, Mac OS, Linux), very easy to install.

DISCLAIMER: I am not affiliated directly or indirectly with Enthought.


  [1]: http://www.enthought.com/products/epd.php