Progress bar disappears during long iterations

[abw333]

I am using Python 3.6 and tqdm 4.10.0.

My code looks like:

with multiprocessing.Pool() as pool:
    for input, output in zip(tqdm.tqdm(args_list, smoothing=0),
                             pool.imap(function, args_list)):
        ...                                                                                                                                                 

Iterations are fairly short (~15 iterations/s), with a few exceptions that may last much longer (~60s/iteration). Whenever I hit these longer iterations, the progress bar will disappear until the iteration completes. Is this expected?

EDIT: I don't expect that multiprocessing is causing this issue, but I haven't verified this, so I left it in the code sample above, just in case.

[lrq3000]

tqdm is not yet parallel safe, please try #329 and please report if this fixes your issue!

Indeed, your issue seems very similar to what is reported in another ticket: #285 (comment)