Question

How would I go about generating a random integer in python that is random but falls into a multiplication table (times table) range per se and is determined by a value I specify?

Example. Say i want to generate a random number between 10 and 100 but it should be a multiple of 7. Possible return values could be 14, 28, 49, 77 etc.

A mockup of the function could look like this:

def gen_random(f, min, max):
    #generate random number between min and max that is a multiple of fac

Is Python’s random module capable of doing this?

Answer 1

Why not just generate a multiplier of fac that gives you a number between your bounds?

import math
import random

def rand_multiple(fac, a, b):
    """Returns a random multiple of fac between a and b."""
    min_multi = math.ceil(float(a) / fac)
    max_multi = math.floor(float(b) / fac)
    return fac * random.randint(min_multi, max_multi)