It’s really chill! I wouldn’t let her crawl around freely, because it’s way too cold in my apartment (she needs constant ambient temps of around 26-28°C during the day and 22-26°C at night). I just sometimes let her hang out on my desk or in my plant shelf supervised.
She only bites food, and even that not very keenly. Royal pythons do have a reputation for being like “I don’t like how that rat smells/it’s got the wrong temperature/ it moves weirdly ->I’m not eating it”. She did bite my finger once because I was wiggling it around in front of her face in a spot that smelled like rat, but that’s fully on me haha. Not that the bite was bad though, (non venomous) snake bites are a total joke. They got very little bite force because their lower jaw isn’t solid, and their teeth do basically no damage because they aren’t evolved for chewing, just for holding on.
I don’t think she minded the butter, but she wasn’t very thrilled about washing the butter off after haha. I was wiping her down with a wet towel and she didn’t like the wetness I think. Forgot all about it within 5 minutes though and happily climbed back into her house when I set her down.