input: Write a function to calculate the cubic values of numbers from 1 to 8 and print them.
  def calculate_cubics(numbers):
      for num in numbers:
          print(num**3)
  
  assert calculate_cubics([1, 2, 3, 4, 5, 6, 7, 8])==None
  assert calculate_cubics([])==None
output: def calculate_cubics(numbers):
      for num in numbers:
          print(num**3)