Actually, if your cage is clean, and your animal is healthy, Blood Pythons can be kept in the 70 to 80% humidity range with no ill effects, maybe even a bit higher.
You can keep them as low as 60% humidity but you need to make sure they're not stressed and comfortable in every way.
Too high like said and you can get mold and funky smelling cages. Scale rot is always an issue as well, but clean cages can keep that at bay.
Too low and you risk RI's, it just dries they're lungs out.
I keep mine anywhere from 65 to 75% at all times and my animals are just fine.
Seems like the trick is with these guys and they're humidity is, big water bowl, and ensured ventilation so the air inside the cage doesn't get all funky or stale.
HTH
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