Addition to Mac OS X documentation

[aak8t@…]

After installing the new version of Python (2.5.4), Mac OS X users should make sure that /Library/Frameworks/Python?.framework/Versions/Current/bin is in their path and if it isn't add it. Otherwise, OS X gets a bit confused about which version of Python you want (2.3 or 2.5), since they exist alongside each other. While installing setuptools, ipython, and numpy make sure they are being installed along this path rather than somewhere else.

[Malte Marquarding]

The section mentions

then open the disk image and install. In a terminal run  python -V , which should return  Python 2.5.4 . If not log out and log back in. 

I have added an extra warning but there isn't much more I can say.