Adults grow to about in length and have a weight near 210 grams. Neonates are about in length and about 4 grams in weight. After a year they average about 25 grams in weight. This makes them smaller than both the Children's python,
A. childreni, and the spotted python,
A. maculosa.
A. perthensis usually has a redder background ground color than these other species and their spots fade, or become less distinct, as they mature. In contrast, the ground color is lighter in
childreni and
maculosa, while their spots stay better defined throughout their life. ==Distribution and habitat==