Its an Asian vine snake(Ahaetulla sp.) Need a better shot of the head to say exactly which species, but could be Ahaetulla prasina,aka short nosed vine snake. That is the one commonly available.But if it doesn't have loreal shields, ie; if the prefrontals are touching the labials it might be A.nasuta. Slightly venomous, not dangerous, mainly arboreal, feeds mostly on lizards.
Cheers
hks

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