input: 
  def avg_list(lst: List[float]) -> float:
      """Calculate the average of a list of numbers.
      >>> avg_list([1.0, 2.0, 3.0, 4.0, 5.0])
      3.0
      >>> avg_list([10.0, 20.0, 30.0])
      20.0
      """
      total = sum(lst)
      return total / len(lst)
  
output:     total = sum(lst)
      return total / len(lst)