Nice snake, but it has the carpet influence of an intergrade in its pattern. I have a small one here in a bag which I got out of my Eclectus aviary on Saturday night when it was still very hot up here (40C during the day). I have yet to let it go because we had a very big bushfire on our property a week or two ago, and as we have a bit of preventative backburning to do with the RFS when conditions improve, I don't want it anywhere near any new fireground.
I'll get a couple of photos up later today, but thomasssss is essentially right about the rosette patterning being the main significant characteristic of a "true" Diamond Python.
Jamie