stdout and stderr display nothing if it's from other thread of logging.QueueListener

[NewUserHa]

Applies To

• Notebooks (.ipynb files)
• Interactive Window and/or Cell Scripts (.py files with #%% markers)

What happened?

import logging.handlers
import queue, logging
import sys
que=queue.Queue()
handler = logging.StreamHandler(sys.stdout)
listener = logging.handlers.QueueListener(que,  handler)
queue_handler = logging.handlers.QueueHandler(que)
root = logging.getLogger()
root.addHandler(queue_handler)
# root.addHandler(handler)
logging.lastResort=None
listener.start()

root.warning("Look out!")

# listener.stop()

then, the second time run the below lines, it starts to output nothing.

root.setLevel(logging.DEBUG)
root.debug('debug test')

But in ipython, it works fine

VS Code Version

1.95.3

Jupyter Extension Version

v2024.10.0

Jupyter logs

Coding Language and Runtime Version

python 3.12.6

Language Extension Version (if applicable)

v2024.22.2

Anaconda Version (if applicable)

No response

Running Jupyter locally or remotely?

Local

[DonJayamanne]

Thank you for filing this issue and sorry you are running into this.
I'm unable to repro this issue at my end.
I've tried this with the latest version of Jupyter pre-release version and latest vscode insiders. It works as expected.
However what I've noticed is, in order to get subsequent outupts from the second cell, i have to run the first cell again.

I can repro this same issue with Jupyter Lab as well, please can you try jupyter lab (instead of ipython terminal, as thats different)

[NewUserHa]

I'm unable to repro this issue at my end.

unable?

[NewUserHa]

However what I've noticed is, in order to get subsequent outupts from the second cell, i have to run the first cell again.

I think that's because it's a clean new thread/new QueueListener, so it worked.

I can repro this same issue with Jupyter Lab as well, please can you try jupyter lab (instead of ipython terminal, as thats different)

with Jupyter Lab locally, just tested, it can always correctly logging to the output of the first cell

[DonJayamanne]

with Jupyter Lab locally, just tested, it can always correctly logging to the output of the first cell

Not sure what you mean

Please can you install vscode insiders, latest pre-release version of Jupyter extension and the latest pre-release version of Notebook Renderers and try this again.

Once done, please can you try to record the screen with jupyter lab and vscode side by side so I can understand exactly what you mean. you can use something like gifcap.dev to record your screen and upload the final gif file.

[NewUserHa]

Not sure what you mean

tried in Jupyter Lab, the example code works without any issue, the following run root.debug('debug test'), the log is outputted to the output area of the first cell (i.e. just below that code block rather than the other cells) of in the Jupyter Lab.

Please can you install vscode insiders, latest pre-release version of Jupyter extension and the latest pre-release version of Notebook Renderers and try this again.

is there any changes for the issue has made to try?