While tracking little Paarthurnax's growth (currently 150g today before feeding!) I've been weighing him about every week, before he is fed. In the back of my mind though, this seems a bit much. I was curious, how often do most keepers check the weight of their pythons?
I do whenever I think about if while I’m handling them. Though I do more frequently with animals that are fasting. I would say about every 2 weeks consistently with fasters. And about every 2-4 weeks on the others.
I never weighed any of my snakes until I got on this site a few years back and been keeping since the late 90s. I'll weigh my BPs about twice a year or so now, more so when I am trying to judge if I feel a female is going to be large enough for breeding. I don't do the whole weight of food item thing, I've always judged prey size based on the animals' girth (no larger than the thickest part).