Developing proper feeding habits and maintaining feeding/health records is a good practice to get into. It allows you to go back through records when in doubt about something. This can help to reduce worry on your part if your snake misses a meal or two, records could show a pattern of feeding and shedding that can explain sudden "problems".
Reluctant Feeders may be happier to eat at night or with lights off, and may prefer to ambush prey from a hide box. Try a variety of prey items and sizes. Could the snake be ill? Reduce handling to a minimum. If an animal refuses all feeding attempts and appears to be loosing weight, consult a veterinarian or experienced herpetologist. If a snake is reluctant to feed it may be induced by placing it in a locking plastic box (with air holes) with crumpled newspaper and leaving it for an hour or so, then introducing a food item.
Water should also be available to these pythons at all times. This will allow the snake to drink at its leisure and assist with proper humidity in the cage, which will lead to good skin sheds. Shedding is dependent on the animals’ growth rate and condition and typically occurs every 3-6 weeks when the animal is young. This can be a period that your snake refuses to feed so don't panic if this happens.
A reliable source of food is a major requirement that must be considered when purchasing a retic. If you can see a problem with being able to provide enough food or appropriate sized items for your retic please don't continue on and get the animal anyway. Some shops may tell you that if you feed your snake less then it will stay relatively small. This is very dangerous, to say the least. If you feed your snake less it will still grow but it will become undernourished and ill, often leading to death. If you want a small retic then please don't purchase one of the larger forms, there are plenty of dwarf retics on the market today and obtaining one isn't hard. Taking the time over your choice now will benefit everyone in the long run.