SciPyのインストールのページの最初に書いてあった
If you already have Python installed, the easiest way to install Numpy and Scipy is to download and install the binary distribution from Download.
If you do not have Python installed on your system you can install the Enthought Python distribution which comes with Scipy and many other useful scientific tools. It is the easiest way to quickly get started with Scipy.
もっとも簡単な方法はEnthought Python Distributionを使うということが・・・