A big pythons goes through 30-40 pounds of food a week, typically mice and gerbils. One of Belseth's reticulated pythons, Kaa, grew from about 18 inches long to 16 feet in two years. They're easy to take care of, once you know how to do it. Snakes that grow large are not for everyone and a person has to know how to care for such exotic creatures, or be willing to learn, or Belseth won't sell to them, he said. He makes sure you know what you're getting into.
Every snake is different.