Larian Studios Forums Divinity: Original Sin 2 - The Modding Dungeon Divinity - Original Sin 2 - Modding Scripting Modulo and osiris randomness

I love the random possibilities of the script (getRandomWeight is amazing), but I am perplexed by the random in Osiris.
What is modulo, how does it work ?
Like if I enter a modulo of 7, what result will I get ?