I have to say, I'm a little upset by this
Individual ball pythons can be maintained in a 20-gallon habitat or smaller plastic pet container as juveniles, and in a 20-gallon or larger habitat as an adult (2-3 years of age).
I would like to point out that there is NO way an adult Ball Python would be comfortable (for any amount of time) in a 20 gallon tank. In fact, at that age, the bare minimum size is 30+ gallon... but never over a 50gallon for the remainder of their lives, as they only get (at most) 6 feet long, which was another error I spotted... it lists them as being able to reach 60" (5ft), but they CAN reach 6 feet...
I kinda feel like this is part of the reason most "experienced" snake owners sneer at the newcomers... Most of them don't know what they're doing, or what they're in for when they do get their first snake.
I don't mean to rant, but.. I hate seeing things like this when I'm looking around at pet stores in general. It makes me wonder how many owners have a 5-6ft python in a 20 gallon tank and that makes me go, "... I hope VERY few actually do that..."