input: Write a function to print all the divisors of a given number.
  
  def print_divisors(num):
      divisors = []
      for i in range(1, num + 1):
          if num % i == 0:
              divisors.append(i)
      print('The divisors of', num, 'are:')
      print(*divisors, sep=', ')
  
  assert print_divisors(12) == None  # The divisors of 12 are: 1, 2, 3, 4, 6, 12
  assert print_divisors(7) == None  # The divisors of 7 are: 1, 7
  assert print_divisors(25) == None  # The divisors of 25 are: 1, 5, 25
  assert print_divisors(1) == None  # The divisors of 1 are: 1
  assert print_divisors(-6) == None  # The divisors of -6 are: -6, -3, -2, -1, 1, 2, 3, 6
output: def print_divisors(num):
      divisors = []
      for i in range(1, abs(num) + 1):
          if num % i == 0:
              divisors.append(i)
              if i != abs(num) and i != -num:
                  divisors.append(-i)
      print('The divisors of', num, 'are:')
      print(*sorted(divisors), sep=', ')