They refer to the sex of the animal listed. 1.0 is one male. 0.1 is one female and 0.0.1 is unknown. So if I had 3.4.5 ball pythons I would have 12 total, 3 male, 4 female and 5 unsexed.
The values represent the sexes of snakes that people own.
The first number is the number of males.
Second is the number of females.
Lastly the number of unsexed.
So for example - 1.2.3 would mean 1 male. 2 females. 3 unsexed.