It's not symmetric. I believe most people with strong mathematical background (like Guido:)) expect lambda x: x % m to be some "computer approximation" to the s

It's not symmetric. I believe most people with strong mathematical background (like Guido:)) expect lambda x: x % m to be some "computer approximation" to the standard mapping from Z to Z/mZ, while not having deep expectations about lambda m: x % m.