Recursive sum of all elements of a given list.

recursive_sum.py

def sum(args):
    """ Returns sum of all elements of a given list, recursively """
    if len(args) == 0:
        return 0

    return args[0] + sum(args[1:])


if __name__ == "__main__":
    list1 = []
    print 'sum of []:',
    print sum(list1)

    list2 = [1]
    print 'sum of [1]:',
    print sum(list2)

    list3 = [1, 2, 3]
    print 'sum of [1, 2, 3]:',
    print sum(list3)

    list4 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
    print 'sum of [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]:',
    print sum(list4)