input: Write a function to compute the cubic values of a list of numbers ranging from 1 to 8. The function should print the result for each number in the list. 
  
  assert compute_cubics([1, 2, 3, 4, 5, 6, 7, 8])==None
  assert compute_cubics([1, 2, 3])!=None
output: def compute_cubics(numbers):
      for num in numbers:
          print(num ** 3)