TQDM progress bar

Description of your problem

The nested-loop function of the TQDM progress bar does not behave as it should.

When you run the TQDM progress bar module in Spyder, running a single loop produces the correct ouput behavior: the progress bar remains on a single line and updates itself. For instance,

from tqdm import trange
from time import sleep

for i in trange(100, desc='Single loop'):
    sleep(0.01)

Produces a single line which updates itself nicely then returns you to the console

Single loop: 50%|█████ | 50/100 [00:00<00:00, 98.52it/s]

However, if you try to use nested loops, TQDM is no longer able to update the two lines without adding newlines, resulting in spammed whitespace. For instance:

from tqdm import trange
from time import sleep

for i in trange(10, desc='1st loop'):
    for j in trange(5, desc='2nd loop', leave=False):
        for k in trange(100, desc='3nd loop'):
            sleep(0.01)

Will produce a console filled with extra whitespace and each new progress update will take up a newline like so:

1st loop:   0%|          | 0/10 [00:00<?, ?it/s]
2nd loop:   0%|          | 0/5 [00:00<?, ?it/s]

3nd loop:   0%|          | 0/100 [00:00<?, ?it/s]

3nd loop:  10%|█         | 10/100 [00:00<00:00, 97.94it/s]

3nd loop:  20%|██        | 20/100 [00:00<00:00, 96.52it/s]

3nd loop:  30%|███       | 30/100 [00:00<00:00, 96.06it/s]

3nd loop:  40%|████      | 40/100 [00:00<00:00, 96.06it/s]

3nd loop:  50%|█████     | 50/100 [00:00<00:00, 96.06it/s]

3nd loop:  60%|██████    | 60/100 [00:00<00:00, 96.21it/s]

3nd loop:  70%|███████   | 70/100 [00:00<00:00, 96.19it/s]

3nd loop:  80%|████████  | 80/100 [00:00<00:00, 96.06it/s]

However, in the regular IPython console started from the command line, this behaves as expected, with each line remaining in place and being updated in-place.

1st loop:  10%|█         | 1/10 [00:05<00:47,  5.33s/it]
2nd loop:  20%|██        | 1/5 [00:01<00:04,  1.06s/it]
3nd loop:  70%|███████   | 70/100 [00:00<00:00, 95.53it/s]

I have tried installing colorama as suggested in this TQDM issue here, but the issue remains. It is also consistent across Windows and OS X versions of Spyder.

In both OS X and Windows, the TQDM behavior works as desired if I input it directly into a command-line python console (or IPython console), but produces the spammy behavior if I run it in the Spdyer console window.

I’m not familiar with the console system, but I believe this may have something to do with “up” character not being respected as it’s passed from the ipython console to the spyder console, and so the upper line cannot be updated and instead. But that’s just a guess

Versions and main components

• Spyder Version: 3.2.5
• Python Version: 3.6.3
• Qt Version: 5.6.2
• PyQt Version: 5.6
• Operating system: Windows (also tested on OS X with same setup)

Dependencies

IPython >=4.0 : 6.1.0 (OK) cython >=0.21 : 0.26.1 (OK) jedi >=0.9.0 : 0.10.2 (OK) nbconvert >=4.0 : 5.3.1 (OK) numpy >=1.7 : 1.13.3 (OK) pandas >=0.13.1 : 0.20.3 (OK) pycodestyle >=2.3: 2.3.1 (OK) pyflakes >=0.6.0 : 1.6.0 (OK) pygments >=2.0 : 2.2.0 (OK) pylint >=0.25 : 1.7.4 (OK) qtconsole >=4.2.0: 4.3.1 (OK) rope >=0.9.4 : 0.10.5 (OK) sphinx >=0.6.6 : 1.6.3 (OK) sympy >=0.7.3 : 1.1.1 (OK)

[dalthviz]

Hi @seyeeet yep this has not been fix but hopefully a fix will be part of Spyder 4.2.1

[ccordoba12]

I thought they were fixed. We’ll take a look at this after we release 4.2.0