I have diamonds, each in a 4x2 foot tank. I heat one end to approximately 32 for 6 hours a day, the rest of the time it's good old Illawarra winter. Being that Diamonds are from Newcastle, Sydney and the Illawarra, I'm thinking that Illawarra Winter is good for them.
It seems sensible to point out at this point that Diamond Pythons don't die in the wild just because the sun gets hot. (Have you ever pointed an infra-red heat gun at a rock that's been in the sun for a few hours?) My Diamonds DO move away from the heat. They also choose how much of their body sits in the heat, often spreading across the branches so mostly their head and upper body is warming up. That's how they use a temperature gradient. My rule of thumb for all pythons is:
1. The sun gets hot. Have a basking point that gets to 30-34 for atleast 4 hours a day.
2. The snake evolved in the wild. Look up the weather forecast for the area where it came from if you're not sure what temperature the "cold end" should get to. (The advantage over being in the wild is that you can skip the rainy days where the sun doesn't come out for a week and it's wet the whole time, cause that seems to be where respiratory infections come from).
This makes me think that all those people who say "don't let the cold end get below 22" for any python are a little over cautious. Bredli's are found near Alice Springs, yes? That means they are okay with the temperature dropping to 6 C at night, and a low humidity. Diamonds are from the illawarra, which means they'll survive at night with 10 C and a high humidity. Coastals and Darwin Carpets, and Childrenii's probably want it warmer at night, but again I doubt it'll kill them. In my opinion, it's those 4-8 hours where the sun is hot that help the snake survive at night, not the actual temperature at night. (Note: I don't actually know how cold Alice Springs and Darwin get. I referred to the Bureau of Meteorology briefly)
So:
I am more cautious of hatchlings, I tend to go for 28-31 at the hot end all day for the first year. I gave my young diamonds plenty of room to move away from the heat. After they start getting bigger, you can start introducing cold nights as well as the temperature gradient. Diamonds like humidity; when in doubt get a bigger water bowl. Don't let the enclosure's temperature get below zero, and keep an eye on them during heat-waves. If they're hanging out near the water bowl, they might want some relief from the heat. I believe diamond pythons are actually more resillient than people give them credit for, and that is where the problems arise. Also, if people live too far north, they need a plan to keep them cool. I don't worry about UV, but it can't hurt especially in the first 2 years when they're growing the fastest. UV Fluros from the pet shop are effective, but can be expensive. Pythons eat their prey whole, and seem to get a fair amount of calcium and vitamin D from their food. I think it's more important for other reptiles who don't get as much from their food.
, quite a few ppl don't read the caresheets and just ask, which is a bit annoying 
