yesterday we go an unexpected visitor a snake about 1.5m long, we have no idea what breed it is and we dont know if it is venomous or not. It's got a creamish belly and black top (similar to a red belly black snake).
from the description you gave it is a 99% probability that it is venomous
i dont think there is a python that is blac on top with creamy belly
it could possibly be a red bellied black tho
i have more problems with brown snakes.
just be careful you or the dogs dont get bitten