input: Write a function to print out the largest value from a given list of numbers.
  def get_max_value(numbers): 
      return max(numbers)
  
  print(get_max_value([2, 4, 1, 6]))  # 6
  print(get_max_value([10, 20, 30, 40]))  # 40
  print(get_max_value([5, 3, 8, 1, 9]))  # 9
  print(get_max_value([]))  # None
  print(get_max_value([1]))  # 1
output: def get_max_value(numbers): 
      if not numbers:
          return None
      return max(numbers)