As was said, rat snake takes in a very large number of colubrid species! In general, while there are exceptions, most North American rat snakes are pretty calm and generally good pets whereas most Asian rat snakes are more flightly, whippy and bitey.
Mandarin ratsnakes are one of the exceptions, in my experience they are much closer to their North American cousins in temperament than any of the other Asian rats I keep.
Corn snakes are technically a rat snake as well and are very good pets. I also keep Trans Pecos and they are great pets. (I also got mine from Doug Kranich, in a trade, good breeder and very nice snakes!)
Here is my female Mandarin, Inara.
And my female Silver Blonde Trans Pecos, Echo.
And my Silver Blonde male, Orlando.