The purpose of the program is to provide some of the more commonly used cosmological parameters, as a function of redshift. The parameters provided are the comoving distance,
If you're in astro, this will be a program you will almost certainly use at some point, if you're not in astro, it will at least be a simple program for you to use to learn python.
Please see the Cosmology.pdf file for a detailed explanation of the physics and the code.