for iteration

[Gerhard Häring]

Franck Bui-Huu wrote:
> Hello,
> 
> I'm trying to customize a list by overriding __getitem__ method but
> this change seems to not work with for iteration.
> When I use my customized list in a for iteration, all changes made
> in __getitem__ are not take into account.
> How can I modify this behaviour ?

To make iteration via "for" possible, the recommended way is to 
implement the iterator protocol in your object, i. e. the object itself 
has a method "__iter__(self)" that will return an iterator object. 
Usually the iterator object is the object itself! The iterator object 
has one method, called "__next__(self)" that will return the next object 
or raise StopIteration when there are no further objects.

For your particular problem, though, please post code to show it.

-- Gerhard