This is an alternative answer for the case where tqdm_notebook doesn’t work for you.

Given the following example:

from time import sleep
from tqdm import tqdm

values = range(3)
with tqdm(total=len(values)) as pbar:
    for i in values:
        pbar.write('processed: %d' %i)
        pbar.update(1)
        sleep(1)

The output would look something like this (progress would show up red):

  0%|          | 0/3 [00:00<?, ?it/s]
processed: 1
 67%|██████▋   | 2/3 [00:01<00:00,  1.99it/s]
processed: 2
100%|██████████| 3/3 [00:02<00:00,  1.53it/s]
processed: 3

The problem is that the output to stdout and stderr are processed asynchronously and separately in terms of new lines.

If say Jupyter receives on stderr the first line and then the “processed” output on stdout. Then once it receives an output on stderr to update the progress, it wouldn’t go back and update the first line as it would only update the last line. Instead it will have to write a new line.

Workaround 1, writing to stdout

One workaround would be to output both to stdout instead:

import sys
from time import sleep
from tqdm import tqdm

values = range(3)
with tqdm(total=len(values), file=sys.stdout) as pbar:
    for i in values:
        pbar.write('processed: %d' % (1 + i))
        pbar.update(1)
        sleep(1)

The output will change to (no more red):

processed: 1   | 0/3 [00:00<?, ?it/s]
processed: 2   | 0/3 [00:00<?, ?it/s]
processed: 3   | 2/3 [00:01<00:00,  1.99it/s]
100%|██████████| 3/3 [00:02<00:00,  1.53it/s]

Here we can see that Jupyter doesn’t seem to clear until the end of the line. We could add another workaround for that by adding spaces. Such as:

import sys
from time import sleep
from tqdm import tqdm

values = range(3)
with tqdm(total=len(values), file=sys.stdout) as pbar:
    for i in values:
        pbar.write('processed: %d%s' % (1 + i, ' ' * 50))
        pbar.update(1)
        sleep(1)

Which gives us:

processed: 1                                                  
processed: 2                                                  
processed: 3                                                  
100%|██████████| 3/3 [00:02<00:00,  1.53it/s]

Workaround 2, set description instead

It might in general be more straight forward not to have two outputs but update the description instead, e.g.:

import sys
from time import sleep
from tqdm import tqdm

values = range(3)
with tqdm(total=len(values), file=sys.stdout) as pbar:
    for i in values:
        pbar.set_description('processed: %d' % (1 + i))
        pbar.update(1)
        sleep(1)

With the output (description updated while it’s processing):

processed: 3: 100%|██████████| 3/3 [00:02<00:00,  1.53it/s]

Conclusion

You can mostly get it to work fine with plain tqdm. But if tqdm_notebook works for you, just use that (but then you’d probably not read that far).

If the other tips here don’t work and – just like me – you’re using the pandas integration through progress_apply, you can let tqdm handle it:

from tqdm.autonotebook import tqdm
tqdm.pandas()

df.progress_apply(row_function, axis=1)

The main point here lies in the tqdm.autonotebook module. As stated in their instructions for use in IPython Notebooks, this makes tqdm choose between progress bar formats used in Jupyter notebooks and Jupyter consoles – for a reason still lacking further investigations on my side, the specific format chosen by tqdm.autonotebook works smoothly in pandas, while all others didn’t, for progress_apply specifically.

To complete oscarbranson’s answer: it’s possible to automatically pick console or notebook versions of progress bar depending on where it’s being run from:

from tqdm.autonotebook import tqdm

More info can be found here

None of the above works for me. I find that running the following sorts this issue after error (It just clears all the instances of progress bars in the background):

from tqdm import tqdm

# blah blah your code errored

tqdm._instances.clear()

Most of the answers are outdated now. Better if you import tqdm correctly.

from tqdm import tqdm_notebook as tqdm

Use tqdm_notebook

from tqdm import tqdm_notebook as tqdm

x=[1,2,3,4,5]

for i in tqdm(range(0,len(x))):

    print(x[i])

For everyone who is on windows and couldn’t solve the duplicating bars issue with any of the solutions mentioned here. I had to install the colorama package as stated in tqdm’s known issues which fixed it.

pip install colorama

Try it with this example:

from tqdm import tqdm
from time import sleep

for _ in tqdm(range(5), "All", ncols = 80, position = 0):
    for _ in tqdm(range(100), "Sub", ncols = 80, position = 1, leave = False):
        sleep(0.01)

Which will produce something like:

All:  60%|████████████████████████                | 3/5 [00:03<00:02,  1.02s/it]
Sub:  50%|██████████████████▌                  | 50/100 [00:00<00:00, 97.88it/s]

Another Example for Progress Bar using tqdm

      from tqdm import tqdm
      my_list = list(range(100))
      with tqdm(total=len(my_list)) as pbar:
          for x in my_list:
             pbar.update(1)

In my case I just needed to update ipywidgets to get rid of the extra printing when using regular from tqdm import tqdm.

Using Python 3.9.2 and tqdm==4.62.3:

from tqdm.notebook import tqdm

for item in tqdm(list_of_items):
    do_something(item)

tqdm automatically loads the fitting progress bar, either for normal code or interactive environments via

from tqdm.auto import tqdm