Issues with tqdm and multiple bars when running under tmux

[ronped]

• I have marked all applicable categories:
  • exception-raising bug
  • visual output bug
• I have visited the source website, and in particular
  read the known issues
• I have searched through the issue tracker for duplicates
• I have mentioned version numbers, operating system and
  environment, where applicable:

import tqdm
import time
import sys

print(tqdm.__version__, sys.version, sys.platform)
array = range(1000)
t = [None]*2

for pos in range(len(t)):
    t[pos] = tqdm.tqdm(total=len(array),
                   desc="Progress bar {}".format(pos),
                   position=pos,
                   dynamic_ncols=True)

for value in array:
    for pos in range(len(t)):
        t[pos].update()
        time.sleep(0.1)

Gives me output like this:

4.59.0 3.8.5 (default, Sep  4 2020, 07:30:14) 
[GCC 7.3.0] linux
Progress bar 0:   0%|                                                                                                                                                                                                                                  | 0/1000 [00:00<?, ?it/s]
Progress bar 0:   0%|▍                                                                                                                                                                                                                         | 2/1000 [00:00<01:40,  9.95it/s
Progress bar 0:   0%|▋                                                                                                                                                                                                                         | 3/1000 [00:00<02:21,  7.02it/s
Progress bar 0:   0%|▊                                                                                                                                                                                                                         | 4/1000 [00:00<02:43,  6.09it/s
Progress bar 0:   0%|▋                                                                                                                                                                                                                         | 3/1000 [00:00<02:21,  7.02it/s]
Progress bar 1:   0%|▍                                                                                                                                                                                                                         | 2/1000 [00:00<02:39,  6.27it/s]
Progress bar 0:   0%|█                                                                                                                                                                                                                         | 5/1000 [00:00<02:56,  5.65it/s]
Progress bar 0:   1%|█▎                                                                                                                                                                                                                        | 6/1000 [00:01<03:03,  5.40it/s]
Progress bar 0:   1%|█▌                                                                                                                                                                                                                        | 7/1000 [00:01<03:08,  5.26it/s]
Progress bar 0:   1%|█▋                                                                                                                                                                                                                        | 8/1000 [00:01<03:12,  5.17it/s]
Progress bar 0:   1%|█▉                                                                                                                                                                                                                        | 9/1000 [00:01<03:14,  5.10it/s]

When not running under tmux it works fine so I am not sure if this is an issue with tqdm or tmux. This also worked fine when I was running under python 2 before upgrading to python 3. I also notice that now with python 3 and tmux that some remains from tqdm from one screen tends to stay in the terminal even if I switch screen in tmux. Not sure what is different from python 2 to 3 that would cause this? I have also tried to redirect output to a file and I see output that looks sensible both when running under tmux. I have tried several versions of tmux, but the latest one was 3.2.

[ronped]

I tried recreating this myself on my macbook using the same versions of tmux, python and tqdm and I am not able to reproduce - so it is highly unlikely that it is any issue with tqdm. So I am seeing this when I am using macos Terminal app and mosh to connect to an ssh server on a system running RH linux with the tool versions given above. Any tips on how to debug this?

[casperdcl]

I also use tmux on Ubuntu and have no issues.

If you resize a panel mid-execution, you need dynamic_ncols=True.

[adyotag]

I can confirm the same issue - using dynamic_ncols as True did not change anything for me unfortunately. I use Kubuntu.

[MichalTrz]

I can also confirm this issue. It never bothered me enough to look for a solution though. It happens on multiple remote servers where I have some ML training.
It usually happens when I run a loop with tqdm and then press some button on my keyboard (usually by accident) when attached to the tmux terminal.
Another way it also happens is when I tmux attach into the tmux terminal with tqdm loop running. But only if I do that several times in a short time span (during the same loop).
I am running Ubuntu Linux 18 and 20 and multiple versions of Python 3.6+.

Ill try the dynamic_ncols=True and let you know if it helps.

[dslemusp]

I can also confirm this issue. It never bothered me enough to look for a solution though. It happens on multiple remote servers where I have some ML training. It usually happens when I run a loop with tqdm and then press some button on my keyboard (usually by accident) when attached to the tmux terminal. Another way it also happens is when I tmux attach into the tmux terminal with tqdm loop running. But only if I do that several times in a short time span (during the same loop). I am running Ubuntu Linux 18 and 20 and multiple versions of Python 3.6+.

Ill try the dynamic_ncols=True and let you know if it helps.

Same here. Using tmux to attach to an ubuntu session from my MacBook Pro. Same behaviour when I accidentally pressed a key in the session. Multiple progress bars per logging output printed.

Did the dynamic_ncols = True worked?