I'm definitely not one for stopping at "just no" and am also not patient enough to wait until i'm 18 and can move out. and i also believe compromise can be found in everything. I'm rather disappointed at what was put forward by jeannine and although this was her opinion, it was not consructive in any way and being that she didn't know the situation that the OP was in, or even have enough sense to realise which comments in this thread were serious or just jokes, half of her comments weren't even valid. My thoughts are, if your mum knows anyone who has snakes that is an adult, see if you can get them to talk, because, lets face it, adults are going to pay more attention to what another adult says, for the simple reason that they can level with them. i believe even jeannine wouldn't mind having her mind changed by someone who she considers her equall. as has already been pointed out, if you do have a conversation on this topic with your parents, point out the positives like, the low cost and the ease of care, as well as put forward ideas that your mum may appreciate, if they make things easier for her.any compromise is going to have conditions, as mine did when i disscussed it with my parents. and many people do find (namely my sister lol) that after consistent positive contact with snakes that they are beautiful creatures, and now my sister even points out snakes she thinks i should get because she likes them. It's not a forcing on of opinion, or bending of rules, just a change of perspective into appreciation. I say, keep it up, and if you show enough interest, your mum might see how getting a snake could benefit you.
Good luck