grocery_stocker wrote: > >> >> 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
replace return with yield and it might work. i have to go eat, but if it doesn't read the python docs on iterators - for example http://docs.python.org/reference/expressions.html#index-1825 andrew -- http://mail.python.org/mailman/listinfo/python-list
