This tutorial covers two web programming models that can be used with Python: the CGI standard and mod_python.
As a general rule if you are in a shared host environment then your only option will be to run python scripts as CGI. Some specialized hosting providers will let you use and configure mod_python. Mod_python's performance and flexibility is much superior to CGI.
There is no need to read the mod_python section if you want CGI and vice versa. They are not related to each other. To follow this tutorial it is required that you have a basic Python programming knowledge. If you need to learn how to program visit the Python Tutorial first.
Please post any doubt, suggestion or critique at the Web Python Board and help making this a better tutorial.