Rodents are raised in a large scale in feed lots just like chickens for the pet industry and for pet food for snakes and other reptiles. They are grain feed just like you would a chicken or any other monogastric animal. 1/3 protein 1/3 carbs 1/3 polylipids. You can buy live mice or rats at petco for your Python to eat. Or keep one as a pet, mice tend to be very friendly once accustomed to their owner.
That’s very interesting and don’t recall ever reading about large scale “rodent farming”.