To clarify my suggestion of a wire cage, it should be common sense to use a wire mesh that's too small for a snake to have any chance of getting through it or getting stuck in it. I think what is being described above would be a metal bar cage, typically used for larger rodents, rather than a wire cage. Otherwise, it wouldn't hold a mouse in, let alone a ball python out. To keep a mouse inside, the wire needs to have openings 1/4 inch or less.