input: def sum_list(input_list):
      """
      This function takes a list as input and returns the sum of the items in the list.
  
      >>> sum_list([1, 2, 3, 4, 5])
      15
      >>> sum_list([-1, 0, 1])
      0
      """
output:     total = 0
      for num in input_list:
          total += num
      return total