def get_divisors(num, possible_divisors):
    """(int, list of int) -> list of int
    
    Return a list of the values from divisors
    that are divisors of num.
    
    >>> get_divisors(8, [1,2,3])
    [1, 2]
    >>> get_divisors(4, [-2,0,2])
    [-2, 2]
    """
    divisors = []
    for item in possible_divisors:
        if item != 0 and num % item == 0:
            divisors.append(item)
    return divisors