Convert an Integer to a String in any base

Converting an Integer to a String in any base.

def to_string(N, base):

    hex_nums = "0123456789ABCDEF"

    if N < base:
        return hex_nums[N]
    else:
        return to_string(N // base, base) + hex_nums[N % base]

print(to_string(2835, 16))    # B13

See also

https://www.w3resource.com/python-exercises/data-structures-and-algorithms/python-recursion-exercise-2.php