from tqdm import tqdm
from time import sleep

class tqdm2(tqdm):
    pass

for i in tqdm(range(10), desc='1'):
    for j in tqdm2(range(10), desc='2'):
        sleep(0.1)

Expected Behaviour

Nested progress bars as usual

Observed Behaviour

Broken nesting: the tqdm labled '2' seems to override the tqdm labled '1', such that '1' is not shown while '2' is running.

Versions

tqdm 4.19.5
python 3.6.3