How to implement __iter__(self) for a container object (Python)

Question

I have written a custom container object.

According to this page, I need to implement this method on my object:

__iter__(self)

Howe

Answer 1

usually __iter__() just return self if you have already define the next() method (generator object):

here is a Dummy example of a generator :

class Test(object):

    def __init__(self, data):
       self.data = data

    def next(self):
        if not self.data:
           raise StopIteration
        return self.data.pop()

    def __iter__(self):
        return self

but __iter__() can also be used like this: http://mail.python.org/pipermail/tutor/2006-January/044455.html