>>> numbers = [10, 20, 30]
>>> print "total(numbers, 0, 3):", total(numbers, 0, 3)
total(numbers, 0, 3): 60
>>> print "total(numbers, 2):", total(numbers, 2)
total(numbers, 2): 30
>>> print "total(numbers):", total(numbers)
total(numbers): 60