list of lists of lists ....

[faulkner]

doh.
ok, so, recursion is just functional programming sugar for a loop.
def get_As(L):
    checking = [elem for elem in L if isinstance(elem, list)]    # the
equivalent of elem in recursion
    all_As = [elem for elem in L if isinstance(elem, A)]
    while checking:
        new_checking = []   # all lists in all lists in checking
        for sub_L in checking:
            for elem in sub_L:
                if isinstance(elem, A):
                    all_As.append(elem)
                elif isinstance(elem, list):
                    new_checking.append(elem)
        checking = new_checking
    return all_As


yomgui wrote:
> I forgot the most important, I am looking for a non recursive method.
>
> thanks
>
> yomgui
>
> yomgui wrote:
> >
> > Hi,
> >
> > I have a list of data (type A)
> > my list can includes element of type A or a lists,
> > these list can includes element of type A or a lists, and so on ...
> >
> > is there a simple way to obtain a single list of all the elemets
> > of type A ?
> > 
> > thanks
> > 
> > yomgui