Most common serpents kept as family pets in the reptile category are the corn snakes and the Royal Python. are green tree pythons good pets? Pythons do have teeth as well as will certainly attack even though they kill their food by constriction. A python can perhaps live to be 40 years old when problems are right as well as has actually been understood to be the lengthiest snake on document, getting to well over 30 feet in size! While this is the exemption to the policy, it needs to still be a consideration when selecting a snake for a reptile animal.