Ball python ratings?

Ok, Im new (ish) to the whole python world and am trying to figure out what the 0.1, 1.0, 2.0 etc is when referring to different Ball Pythons, any insight would be awesome.
Thanks

Actually, that applies to all reptiles. The first number is the number of males, the second the number of females. If there is a third number, it is unsexed or unknown. So, for example 2.3 is two males and three females. 0.1.2 is zero males, one female and two unsexed or unknown.

That makes a lot of sense, thank you!