input: 
  def find_divisors(num: int) -> List[int]:
      """ Find and return all divisors of a given number.
      >>> find_divisors(12)
      [1, 2, 3, 4, 6, 12]
      >>> find_divisors(17)
      [1, 17]
      """
  
output:     divisors = []
      for i in range(1, num + 1):
          if num % i == 0:
              divisors.append(i)
      return divisors