input: from typing import List
  
  def get_max_value(numbers: List[int]) -> int: 
      """Return the largest value from a given list of numbers.
      >>> get_max_value([2, 4, 1, 6])
      6
      >>> get_max_value([10, 3, 7, 5])
      10
      """
      return max(numbers)
output:     if not numbers:
          return None