Peter Otten schrieb: > Diez B. Roggisch wrote: > >> Florian Lindner wrote: > >>> can I determine somehow if the iteration on a list of values is the >>> last iteration? > >> def last_iter(iterable): >> it = iter(iterable) >> buffer = [it.next()] >> for i in it: >> buffer.append(i) >> old, buffer = buffer[0], buffer[1:] >> yield False, old >> yield True, buffer[0] > > This can be simplified a bit since you never have to remember more than on > item: > >>>> def mark_last(items): > ... items = iter(items) > ... last = items.next() > ... for item in items: > ... yield False, last > ... last = item > ... yield True, last > ... >>>> list(mark_last([])) > [] >>>> list(mark_last([1])) > [(True, 1)] >>>> list(mark_last([1,2])) > [(False, 1), (True, 2)]
Nice. I tried to come up with that solution in the first place - but most probably due to an java-coding induced brain overload it didn't work out:) But I wanted a general purpose based solution to be available that doesn't count on len() working on an arbitrary iterable. Diez -- http://mail.python.org/mailman/listinfo/python-list
