alive_bar in Jupyter needs force_tty

[Miladiouss]

The alive bar does not show during Jupyter cell process and only outputs the final frame:

from alive_progress import alive_bar
from time import sleep

x = list(range(50))
with alive_bar(len(x), title='Jupyter Alive Progress Bar:') as bar:
    for i in x:
        sleep(.1)
        bar()

Jupyter Alive Progress Bar: |████████████████████████████████████████| 50/50 [100%] in 5.0s (9.98/s) 

Things work properly in my terminal.

Here is my system configuration if needed:

• Ubuntu 22.04

• Alive Progress:

  alive-progress            2.4.1                    pypi_0    pypi

• Jupyter with Anaconda:

  jupyter-server            1.18.1                   pypi_0    pypi
  jupyter_client            7.2.2              
  jupyter_core              4.10.0           
  jupyterlab                3.4.3                    pypi_0    pypi
  jupyterlab-pygments       0.2.2                    pypi_0    pypi
  jupyterlab-server         2.15.0                   pypi_0    pypi
  jupyterlab-widgets        1.1.0                    pypi_0    pypi

[rsalmei]

Well, if there was that output, it seems to be working to me. What did happen?

[Miladiouss]

There is no progress bar. After the cell is finished, the output above is printed, with that warning sign emoji (⚠︎). I updated my previous post.

[TheTechRobo]

You need to show your code. Generally when there's the warning sign and 0%, it's because you forgot to increment the bar.

[rsalmei]

Exactly what @TheTechRobo said, thanks. And, if it appears only after ending, this is intended behavior, since the jupyter does not report itself as interactive. You have to use force_tty=True.

Please show your code, then we would not have to be figuring things out by ourselves.

[Miladiouss]

Thank you @TheTechRobo. As your suggestion, providing the force_tty=True corrects the behavior :+1:

from alive_progress import alive_bar
from time import sleep

x = list(range(50))
with alive_bar(len(x), title='Jupyter Alive Progress Bar:', force_tty=True) as bar:
    for i in x:
        sleep(.1)
        bar()

[rsalmei]

You're welcome!