Most likely not...

A Ball python could strike at your cat. Most likely if this took place it would be out of fear wrather than that of prey instinct. Being your cats curiosity and sticking its face around the snake.

On the other hand I would watch the curiosity of your cats as if something did happen I would be worried about the snake and how the cats could shred it to peaces in matter of seconds if the situation ever did arise.

Just insure that your enclosure is secured properly all the time. They do tend to be escape artist and it is usually do to human error that this happens. Never rush with your snake, make sure evrything is done in the same manner every time.

I guess i am saying be OCD with how you maintain your pets and this should never come into question.

J