input: 
  def get_max_value(numbers: List[int]) -> int:
      """
      This function takes a list of integers and returns the largest value.
  
      >>> get_max_value([2, 4, 1, 6])
      6
      >>> get_max_value([-1, 0, 5, -10, 100])
      100
      """
      return max(numbers)
  
output:     if not numbers:
          return None