In addition to putting the probe on the glass for an accurate reading of temps, are you using a thermostat to control the heat source?
An active ball python, especially during the day times, and especially when they are new, means that the ball python is still adjusting to the new environment and is feeling stressed. As has been mentioned, leave the snake alone for a week or so and attempt to feed. If the snake refuses, leave the snake alone for another week and try again![]()