Look, it's simple:

1) Kick in the front door
2) Proudly display your new snake
3) Profit



Okay, so it isn't that simple. lol

Honestly, if your parents are against it.. then they are against it. I know when I was a kid, begging/whining/pleading/bargaining/etc didn't get me anywhere but in more trouble lol. Your parents may be different, I was raised pretty strict lol. My old man was career USAF, so it was a strict military household

If their rule is no snakes, then it is no snakes. Don't try to sneak one in, hide it from them, etc. It is their house, and they can choose what they want brought into it. As much as you probably don't want to hear that... it is what it is. Wait until you are all grown up and out on your own. Then you can make your own rules