Python VS 代码未连接 IPython kernel

Question

I have created a new virtual env and trying to connect with the VS code. When I open the folder in VS code that contains the file and virtual env, on the left bottom side I can see the python interperator selected as shown in the following figure:

However, when I run the program, it shows the message that it is connecting to IPython Kernel as shown in the following picutre

However, after some time it throws an error message that "unable to start session for kernel python" as shown in the following picture:

The top right corner of VS code is shown in the following picture:

Could anyone help me in fixing the issue?

Answer 1

An issue was opened today in the Python VS Code repository that describes a similar problem. Their recommended fix is to close VS Code and then revert the traitlets dependency to version 4.3.3 with this command:

python -m pip install 'traitlets==4.3.3' --force-reinstall

Answer 2

I had the same issue starting yesterday with two new virtual environments and different python versions (3.8.1 and 3.8.5). I can confirm that Simm Enley's suggested terminal command worked for me.

python -m pip install 'traitlets==4.3.3' --force-reinstall

It has to be executed from within the corresponding virtual environment. A newer version of traitlets (5.0.0) installed by VSCode into the new virtual environment in order to to run the Interactive Terminal caused the issue, it seems like.

Answer 3

the reason is newer version of traitlets (5.0.0) installed by VSCode into the new virtual environment; but the ipykernel and tornado is incompatible with ipykernel and tornado; run the code in Terminal: pip install --upgrade ipykernel pip install --upgrade tornado

Answer 4

2023.01.15 - Problem description: Jupyter in VS Code got stuck at connecting to Python kernel

I was using VS Code version 1.74.3 (user setup) with the Release Python extension version v2022.20.2, having the version details shown below:

My Python version was 3.10.6 64-bit:

I tried all of the above, and none worked for me to get Jupyter unstuck.

I ran the Python 3.10.6 setup to repair it, but that did not work:

I updated various packages, but that did not work either:

• pip install --upgrade ipykernel
• pip install --upgrade traitlets
• pip install --upgrade tornado

Some details from the above upgrades:

• Requirement already satisfied: traitlets>=5.4.0
• Requirement already satisfied: tornado>=6.1
• (from ipython>=7.23.1->ipykernel)

★★★★★ After uninstalling and reinstalling VS Code, Jupyter worked as before.

When I installed the Pre-Release Python extension (by mistake),

Jupyter got stuck again. I uninstalled the Pre-Release Python extension, and re-installed the Release Python extension shown in the image above; Jupyter worked again.

Answer 5

I had the same problem and none of the solutions above worked for me. I succeded to resolve the problem by dowgrading Jupyter version from v2022.11.1003412109 to v2022.9.1303220346 in the extension manager.