input: Write a function that prints 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([3, 9, 5])==9
  assert get_max_value([10])==10
  assert get_max_value([])==None
  assert get_max_value([-1, -3, -5, -2])==-1
output: def get_max_value(numbers):  
      if not numbers:
          return None
      return max(numbers)