I've had bad and.. suprisingly somewhat good experiences with cats and snakes co-existing.
Bad, decapitated snake. (I didn't know the snake had escaped until I found its body)
Good, one of my snakes escaped and I knew about it right away. I kept a careful eye on the cat, and eventually the cat led me right to the snake. The snake ended up getting a small wound during the short interaction, which is now totally healed. I believe that I never would have found the snake (a hatchling) if it hadn't been for the cat.
Of course there are also cats who wish they were snakes. Co-habing strongly discouraged.