input: def sum_list(input_list):
      """
      Calculate the sum of the items in the given list and return the result.
      
      Example:
      >>> sum_list([1, 2, 3, 4])
      10
      >>> sum_list([5, -2, 0, 10])
      13
      """
output:     total = 0
      for num in input_list:
          total += num
      return total