None of my pythons eat outside their enclosure. Some simple, common sense rules apply when feeding your snake in their enclosure.
First, I ALWAYS use latex free disposable gloves and a long pair of tongs when I feed my snakes. My bare hands NEVER touch the food my snakes eat, hence there is little to no chance of them mistaking my bare hands in their enclosure for food. I have NEVER had any of my pets strike at me when I've put my hands in their enclosures. I always make sure I use the same hand soap before I reach into their enclosures to ensure they recognize my scent and know also know it is not feeding time.
I know it sounds like overkill, but my snakes are totally comfortable with me handling them and they recognize my scent immediately and respond accordingly. Remember, the less stress you induce on your pet, the healthier the pet. Less stress also results in a more steady feeding cycle and less frustration on your part. Keep in mind that, no matter how hard you try, your snake may just not eat in a seperate enclosure. Each pet is different and you have to accept them for their own quirky personalities and likes and dislikes. After all, that's what makes them so much fun!