You can add commands to run on the system immediately after the ks.cfg has been parsed. This section must be at the end of the kickstart file (after the commands) and must start with the %pre command. You can access the network in the %pre section; however, name service has not been configured at this point, so only IP addresses work.
Note that the pre-install script is not run in the change root environment.
--interpreter /usr/bin/python
Allows you to specify a different scripting language, such as Python. Replace /usr/bin/python with the scripting language of your choice.