[orlp]

Assuming a, b are integers, the following answers are exact:

    def div_floor(a, b):
        return a // b

    def div_ceil(a, b):
        return (a + b - 1) // b

    def div_trunc(a, b):
        return a // b if (a < 0) == (b < 0) else -(-a // b)

    def div_round(a, b):
        return (2*a + b) // (2*b)