Yes, it is possible to train a snake just as it is very possible to train alligators and other wildlife and such. Many venomous keepers train their venomous snakes to go into their “hide box” when the cage is to be cleaned or the snake is to be transported. Usually the training consist of a repetitive tapping sound (vibration) on the cage.  A snake can be trained within 2 months if not sooner.  Simple conditioning!