where do you live (town/region)?
can you count around the skin at about the middle of the body (midbody scales) along the diagonal line of scales from the big wide belly scale (ventral scale) and back around to the other side?
that will give the best information without the head scales to look at because they all have different numbers and we can at least tell you if it is a python or likely non-venomous. I can count at least 15 from the photo but i can't see if there are more on the other side. its not a green tree snake because they only have 13, if it has 30 or more it is a python, which would be good news for you but it doesn't look like it. unfortunately we probably won't be able to give you much more clarity, the head is the most important ID part, there is something called a loreal scale next to the eye which can tell you if it is venomous or not.
This website can help,
https://www.arod.com.au/arod/scale/
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the other thing to look as is the anal scale, if it is single or divided? basically it the point where the body ends and the official tail of the snake starts.
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