^^^ exactly this ^^^
Weight will fluctuate a bit with each meal, each poop/pee, etc... focus on body proportion rather than weight. That being said, I do weigh my snakes regularly as well as keep other records of feedings, refusals, sheds, etc...I weigh them primarily to have records in case of food strikes, illness, etc... or reference in case of weight loss. I figure it can't hurt to have some helpful info for the vet, just in case.