Hi Folks How recreated a integer list with generator? import random tmp = [] for x in range(0,600): tmp.append(random.randint(0,5000)) tmp = list(set(tmp)) tmp.sort() Should be possible recreated this list using same magic math formula or numpy array? Can I create a generator? How? What is my target? I need store this list im my database, the list itself get big size (resources) so I want save resources and save the generator object with pickle. Is it possible? What I have: size = len(tmp) min = tmp[1] max = tmp[-1] All numbers are integer and it is a random serie so each list will have your own generator. Again tmp is a static list and must be recreated with a generator the target is pickle the generator to be smaller than the list itself. Best Regards Mario