notebook: update disable=None behaviour (#880) tqdm.keras: support tensorflow.keras as well as keras (#885) add contrib (#882) tenumerate (#840 <- #480, #402) tzip <= zip tmap <= map add concurrent module thread_map <= concurrent.futures.ThreadPoolExecutor.map process_map <= concurrent.futures.ProcessPoolExecutor.map add itertools module (#225) stub product add & update tests add & update documentation README examples/ update CI framework