I can't say for sure how far it should go in terms of scale counts, it should be similar to that of other Australian pythons, especially Liasis (these guys used to be in the genus Liasis, and they are likely very closely related), but there is a fairly obvious difference visible just externally. Females have a drastic decrease in girth at the cloaca, whereas males have a very gradual decrease in size past the cloaca.
If you post pictures of your snake's cloacal region, I can most likely venture a fairly accurate guess as to the sex.
-Eric

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