A chart like this is more appropriate for boas, burms, retics, etc. as they don't often fast and they will happily eat themselves obese. Mine will occasionally refuse, usually when in shed, but it's rare.
The "chart" for my adult ball pythons looks more like:
Non-Breeding Females - offer another feeder two weeks after she last ate. If she eats, don't offer again for two weeks. If she doesn't eat, offer weekly until she eats, then wait two weeks.
Breeding Females - she gets what she wants when she wants it, at weekly intervals while building and for several months after laying. Once she starts refusing, use the above schedule.
All Males: same as non-breeding females but use three week intervals rather than two weeks.
Bear in mind that the vast majority of snakes in captivity are overfed. Once they hit adulthood they don't need to eat every week, and many only need to eat once a month.
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