To train a pet snake to be handled, you can start by getting them used to your presence and touch by gently stroking them with a soft object like a glove or a cloth. Gradually introduce your hand and let them get comfortable with your touch. Handle them for short periods at a time and gradually increase the duration as they become more accustomed to being held. It's important to handle your snake regularly to maintain their comfort with human interaction. Remember to always approach them calmly and gently to build trust and minimize stress.