I'm planning on putting a store's inventory on a Drupal site and I'm wondering if it's possible to create a script (maybe in python/php?) to enter the data automatically to Drupal with CCK? Thanks in advance!
There are a couple of Drupal modules dedicated to different scenarios of external (mass) imports - check this overview for a options/comparisons.
If you have very specific needs, you could write your own module, using the existing ones and the links/hints provided by googletorps (+1) for guidance on how to do the actual insertion while ignoring the generalizations.