well if you want a python get a jungel carpet python if ya want a boa get a red tail boa
jungel capets grow like 6 ft rtb grow like 6-8 ft also another python that is a very good pet is a ball pythons they come in all color and prices lol they usually grow 3-5ft theirs also king snakes their nice (if played with) and grow like 3-4 ft if ya want something big get a yellow anaconda