Unless your husband is severely phobic about snakes, I say go for it. As the others mentionned, you aren't a child and as long as you take full responsibility, I don't think he would have much to say about it. Aside maybe where you keep your snake, i.e. I could understand if he doesn't like it to have it in an area that will always be in his face such as the kitchen, etc.
When my bf complains about me getting another animal, I always bring up his golf hobby. In the three years we've been together I have never complained about anything regarding his hobby and he plays a LOT! So, I bring that up and he leaves me alone. I tell him "Keep nagging me about my pets and I'll have a ball nagging you about your golf when you start up again"
I never hear another word!!!
Keeper of 5 snakes, leopard geckos, 1 green iguana, 20+ tarantulas, 2 dogs & a bunch of rats!