input: from typing import List
  
  def sum_list(input_list: List[int]) -> int:
      """ Calculate the sum of the items in the given list.
      >>> sum_list([1, 2, 3, 4, 5])
      15
      >>> sum_list([-1, -2, -3, -4, -5])
      -15
      >>> sum_list([])
      0
      """
output:     total = 0
      for num in input_list:
          total += num
      return total