input: Write a function to print out the largest value from a given list of numbers. The function should handle an empty list by returning None.
  
  def get_max_value(numbers):
      if not numbers:
          return None
      return max(numbers)
  
  print(get_max_value([2, 4, 1, 6]))  # 6
  print(get_max_value([10, 3, 8, 5]))  # 10
  print(get_max_value([4]))  # 4
  print(get_max_value([]))  # None
output: def get_max_value(numbers):
      if not numbers:
          return None
      return max(numbers)