Re: ball python not eating
One week is nothing to worry about. As stated, just keep an eye on his temps and try again next week. I have a Dumeril's who, even at 6 months old, would only accept food maybe1 out of 3 tries! Yet, she is growing like a weed. Ball pythons are known to be finicky with food at times. As long as he's not losing weight, I wouldn't worry.
Re: ball python not eating
My adult male BP went 8 months off food and then started eating again. This is normal with Ball Pythons. It could go even longer than 8 months.