input: Write a function to print out the largest value from a given list of numbers.
  
  def get_max_value(numbers): 
      return max(numbers)
  
  assert get_max_value([2, 4, 1, 6]) == 6
  assert get_max_value([9, 3, 5, 1, 8]) == 9
  assert get_max_value([10]) == 10
  assert get_max_value([-2, -4, -1, -6]) == -1
  assert get_max_value([]) == None
output: def get_max_value(numbers): 
      if not numbers:
          return None
      return max(numbers)