As was said, it is SERIOUSLY not recommended. Personally I would never do that because it promotes the spread of diseases, makes it hard to realize who is healthy and who isn't by things like stool and urine, and because they will almost always end up competing for food and space and heat.

Housing two snakes together, no matter the species, will undoubtedly cause them unnecessary stress and so many things that are easy to avoid can happen to them. I highly recommend against it.