When acquired as babys, and raised with proper handling techniques and with strict adherence to interaction guidelines, there are no snakes (at least non-venomous ones) that can not become calm, tractable adults.
Learning to "read" your animals as you open an enclosure can prepare you for what kind of mood they are in. Again, strict interaction guidelines should be followed. For example:

If I am feeding any snake, the prey (FT) is offered immediately upon opening the door. If not, I open the door and wait about a minute before offering my hand (as in, they start to come out and the first thing they smell is my hand). By ALWAYS following this procedure, the snake learns when to expect food and when not to. Same for animals that are fed in separate containers. Door (or lid) opens and it's either food or me. Once this practise is learned, I have had no bites in many, many years.

Chris