Is the white on pieds a random factor?

[Anatopism]

Is the amount of white that a piebald ball python gets a random factor? How much does the amount of white on the parents effect the amount of white that the offspring receive?

Low white animals can produced high white animals, and vice versa. You can have a 90% high white animal (that is to say, an animal that is 90% white), who gives you a bunch of babies that are only 10% white.