Well like any snake, they have the means to bite when threatened, or if they mistake you for food. In my small experience, my snakes have never struck or bitten at me. They roll into a tight little ball to protect their head rather than go on the offensive.

I think for anyone that is uneasy around snakes, a ball python is a great choice. They do tend to roll in a ball when nervous, or if they try to get away, the last thing on their mind is biting.