nested or positioned bars are broken #1139
Description
- I have marked all applicable categories:
- 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
Versions:
Windows 10
tqdm 4.59.0
sys.version 3.8.5 (tags/v3.8.5:580fbb0, Jul 20 2020, 15:43:08) [MSC v.1926 32 bit (Intel)]
sys.platform win32
Mac OS Catalina 10.15.6
tqdm 4.59.0
sys.version 3.9.2
sys.platform darwin
Nested or positioned bars are not working. Visual output is either a series of scrolling bars, or bars that jump around. The current "nested bars" example at https://github.com/tqdm/tqdm#nested-progress-bars
from tqdm.auto import trange
from time import sleep
for i in trange(4, desc='1st loop'):
for j in trange(5, desc='2nd loop'):
for k in trange(50, desc='3rd loop', leave=False):
sleep(0.01)
generates this on Windows:
C:\Users\Michael\Downloads>python test.py
1st loop: 0%| | 0/4 [00:00<?, ?it/s]
2nd loop: 0%| | 0/5 [00:00<?, ?it/s]
3rd loop: 0%| | 0/50 [00:00<?, ?it/s]
3rd loop: 14%|███████▉ | 7/50 [00:00<00:00, 68.50it/s]
3rd loop: 28%|███████████████▋ | 14/50 [00:00<00:00, 65.75it/s]
3rd loop: 42%|███████████████████████▌ | 21/50 [00:00<00:00, 65.05it/s]
3rd loop: 56%|███████████████████████████████▎ | 28/50 [00:00<00:00, 64.88it/s]
2nd loop: 0%| | 0/5 [00:00<?, ?it/s]
1st loop: 0%| | 0/4 [00:00<?, ?it/s]
On Mac, it generates bars that mostly work but which scroll down whenever loop2 completes, leaving a display that shows
2nd loop: 100%|███████████| 5/5 [00:03<00:00, 1.66it/s]
2nd loop: 100%|███████████| 5/5 [00:03<00:00, 1.66it/s]
2nd loop: 100%|███████████| 5/5 [00:03<00:00, 1.66it/s]
2nd loop: 100%|███████████| 5/5 [00:03<00:00, 1.66it/s]
1st loop: 100%|███████████| 4/4 [00:12<00:00, 3.03it/s]
Further testing shows that other examples using position, including both threading and multiprocessing examples, all produce broken output on both Windows and Mac.