x = [1, 2, 3, 4]
#same array, but the last item.
notLast = x[0:-1]
>>> total = 0
>>> for n in [5.99, 12.99, 20.99, 129.99]:
total += n
print('Total is now', total)
Total is now 5.99
Total is now 18.98
Total is now 39.97
Total is now 169.96
>>> total
169.96