The following example script output is quite messed up on Python 2.7:

from tqdm import tqdm, trange
from time import sleep

for i in trange(10, desc='outer'):
  for j in trange(10, desc='inner'):
    # Print using tqdm class method .write()
    sleep(0.1)
    if not (j % 3):
        tqdm.write("Done task %i.%i" % (i,j))

The issue seems to be the code that locates other instances sharing the same underlying fp -- on Python 2, this gets wrapped by SimpleTextIOWrapper, so then the comparisons of the fps with each other and with stdout never succeed, and the 'clear' code doesn't execute.