In other words, you are assuming that the normal gene is the dominant gene and the white gene is the recessive gene in a dominant/recessive relationship. This is the most common relationship and the safest to assume pending more information.
Latest information is that most of the members of the blue-eyed leucistic (BEL) complex of genes are codominant (aka incompletely dominant) to the normal gene. And many combinations can produce a more or less white snake.
List of known gene complexes in the ball python:
https://www.owalreptiles.com/complexes.php
Dominant/recessive relationship:
Genes in pair | appearance
--------------------|--------------
gene 1/gene 1 | appearance 1
gene 1/gene 2 | appearance 1
gene 2/gene 2 | appearance 2
Gene 1 is the dominant gene, and gene 2 is the recessive gene.
Codominant (aka incomplete dominant) relationship
Genes in pair | appearance
--------------------|--------------
gene 1/gene 1 | appearance 1
gene 1/gene 2 | appearance 3
gene 2/gene 2 | appearance 2
Appearance 3 could be more or less intermediate between appearance 1 and appearance 2. Or appearance 3 could be more extreme than either appearance 1 or appearance 2. Or appearance 3 could be the same as appearance 1 in some parts of the body and the same as appearance 2 in other parts of the body.
The relationship between two genes is a relative relationship. It is not a built-in property of a single gene. It is quite possible for one gene to be dominant to a second gene, recessive to a third, and codominant to a fourth member of the gene complex.