is ball python has period of fasting each year?

[Kaorte]

yes I put them together.... but when I did feeding I move one to another cage a while. I put baby mice so I think it is safe for my snake. If I feed with medium rat I always keep watching it (usually I kill the rat first)

Mice are actually known to do more damage then a rat. Do yourself a favor and don't leave any live feeder un-attended with your snake.

Your snakes will be happier if they each have their own enclosure. ball pythons are not social animals and there is no benefit to keep them together other then to save money which is not a good enough reason.