import uuid test = uuid.uuid4().hex[:8] codelist = [] while len(codelist) < 1000: codelist.append(uuid.uuid4().hex[:8]) list_for_links = ["http://web54.bonneconlab.uni-bonn.de/room/study/?participant_label=" + s for s in codelist] with open('labels.txt', 'w') as f: for item in codelist: f.write("%s\n" % item) with open('Links_for_survey.txt', 'w') as f: for item in list_for_links: f.write("%s\n" % item)