Hi i want a snake. My mom doesent want one that gets over 5 ft and I want a python or a boa. I wondered what is a good beginner python or boa and what size cage the boa that is best would need. I would really like one that could fit in either a 20 gallon tank or a 55 gallon tank because the pet store hooks me up

. But if it does need a 55 or a 20 what is a good method of keeping the snake in the cage.
Thanks A Bunch
Alex