Iteratoration question

[grocery_stocker]

>
> in summary: iterator is bound to one instance of "it", while some_func()
> returns a new instance each time it is called.
>
> BUT
>
> while what you are doing is interesting, it is not the same as Python's
> iterators, which use "yield" from a function and don't require storing a
> value in a class.  look for "yield" in the python docs.  this comment may
> be irrelevant; i am just worried you are confusing the above (which apart
> from the mistake about instances is perfectly ok) and python's iterators
> (which use next(), yield, etc).
>

Okay, one last question for now

When I have the follow class

>>> class it:
...    def __init__(self):
...        self.count = -1
...    def next(self):
...        self.count +=1
...        if self.count < 4:
...            return self.count
...        else:
...            raise StopIteraton
...



>>> value = it()

How comes I can;t go over 'value' like in the following

>>> for x in value:
...     print x
...
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: iteration over non-sequence


But yet, I can do...

>>> value.next()
0
>>> value.next()
1
>>> value.next()
2
>>> value.next()
3
>>>