Another explanation is the fact that when you stand and look at the bush around here and pull apart the colours you see, they are predominantly black, green and yellow.
If you've ever released a diamond back into the bush and marvelled at the way they melt back into the environment its easy to see how they camoflage in.
A lot of call outs are to people who say they have a "green" python. But they don't actually have the colour green on them. The pattern of the black, yellow and white, plus the reflecting of light off the scales can give the snake a greenish tinge.
Though diamond males are very much lovers and not fighters, dominance can still be an issue with them. I have observed wild males wrestle, when a new male entered the scene,
though shortlived and without biting.