list の iterator ってようはこんなもん?

listiter.py

class ListIter(object):

    def __init__(self, target):

        self.target = target
        self.index = 0


    def next(self):

        if len(self.target) <= self.index:
            raise StopIteration();

        self.index += 1

        return self.target[self.index-1]


    def __iter__(self):

        return self


lst = range(10)

for i in ListIter(lst):

    print i