Python: How to Replace Tqdm Progress Bar by Next One in Nested Loop?

You can achieve this by resetting the progress bar object every time before inner loop starts.

Try the following code to achieve the results you want.

import time
from tqdm.notebook import tqdm

#initializing progress bar objects
outer_loop=tqdm(range(3))
inner_loop=tqdm(range(5))

for i in range(len(outer_loop)):
    inner_loop.refresh()  #force print final state
    inner_loop.reset()  #reuse bar
    outer_loop.update() #update outer tqdm

    for j in range(len(inner_loop)):
        inner_loop.update() #update inner tqdm
        time.sleep(1)

Output:

Thanks @michael-schroter for bringing this to my attention and @jaroslav-bezděk for the original post.

I'd prefer @anton-pomieshchenko's answer. However as noted, the inner bar keeps disappearing and re-appearing each time the outer bar updates, which could look bad if it happens quickly and frequently.

Correct answer (assuming you don't need to re-use the outer bar, but do want to re-use the inner one):

from time import sleep
from tqdm.auto import tqdm

with tqdm(range(3)) as outer:
    inner_total = 3
    with tqdm(total=inner_total) as inner:
        for i in outer:
            inner.reset(inner_total)  # reinitialise without clearing
            for j in range(inner_total):
                sleep(1)
                inner.update()
            inner.refresh()  # print last state without clearing

Please find the modified answer from @hamza-khurshid for three loops.

import time
from tqdm.auto import tqdm

#initializing progress bar objects
outer_loop=tqdm(range(3))
mid_loop=tqdm(range(5))
inner_loop=tqdm(range(7))


for i in range(len(outer_loop)):

    mid_loop.refresh()  #force print final state
    mid_loop.reset()  #reuse bar
    outer_loop.update() #update outer tqdm

    for j in range(len(mid_loop)):
        inner_loop.refresh()  #force print final state
        inner_loop.reset()  #reuse bar
        mid_loop.update()  ##update mid tqdm

        for k in range(len(inner_loop)):
            inner_loop.update() #update inner tqdm
            time.sleep(1)
print(i,j,k)

Please find the output below:

This is also the answer for the question on github

Thanks & Best Regards

Michael