input: def get_max_value(numbers: List[float]) -> float:
      """ Returns the largest value from a given list of numbers.
      >>> get_max_value([2, 4, 1, 6])
      6
      >>> get_max_value([10, -5, 100, 3])
      100
      >>> get_max_value([-1, -2, -3, -4])
      -1
      """
output:     if not numbers:
          raise ValueError("The list is empty")
      max_value = numbers[0]
      for num in numbers:
          if num > max_value:
              max_value = num
      return max_value