ID on Snake in Hills District

[jrw99]

Spotted this lovely specimen on my back steps sunning itself, I thought it was a diamond python but friends have suggested otherwise.
It has a small head (not broad like a python) and a pale yellow belly though difficult to see in the photo.
Can anyone suggest what it may be ?
Location is Hills District Sydney NSW

 

[Pythonguy1]

Green Tree snake (Dendrelaphis punctulatus)

 

[Ramsayi]

What he ^^^ said.

 

[jrw99]

Thank you ,appreciate your response
I have only ever seen black snakes and the occassional brown in my area, though fewer this year
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Looks like my green tree snake has a baby brother, sunning himself at my back door