input: from typing import List
  
  def sum_list(input_list: List[int]) -> int:
      """ Given a list of integers, return the sum of the items in the list.
      >>> sum_list([1, 2, 3, 4])
      10
      >>> sum_list([-1, -2, -3, -4])
      -10
      >>> sum_list([0])
      0
      """
output:     total = 0
      for num in input_list:
          total += num
      return total