Jupyter Lab 4.0.11中ipywidgets安装问题求助

算力阿峰

2026-4-20

Hi there! Since you're new to Python and working with your first macOS setup, I totally get how frustrating it can be when tools like ipywidgets don't show up as installed even after you thought you set them up. Let's walk through fixing this together for your Jupyter Lab 4.0.11 environment.

First, here's the environment info you shared from running jupyter --version:

IPython          : 8.20.0
ipykernel        : 6.29.0
ipywidgets       : not installed
jupyter_client   : 8.6.0
jupyter_core     : 5.7.1
jupyter_server   : 2.12.5
jupyterlab       : 4.0.11
nbclient         : 0.9.0
nbconvert        : 7.14.2
nbformat         : 5.9.2
notebook         : not installed
qtconsole        : not installed
traitlets        : 5.14.1

Step-by-Step Fixes

Jupyter Lab 4.x has specific requirements for ipywidgets, so follow these steps carefully:

Install the ipywidgets Python package
Open up your terminal and run one of these commands depending on whether you use pip or conda:
- For pip users:
```
pip install ipywidgets
```
- For conda users (if you're using a conda environment):
```
conda install -c conda-forge ipywidgets
```
Set up the Jupyter Lab extension
Unlike older Jupyter Lab versions, 4.x still requires the widgets manager extension to work properly. Run this in your terminal:
```
jupyter labextension install @jupyter-widgets/jupyterlab-manager
```
If you get a prompt asking to build Jupyter Lab, just run the suggested jupyter lab build command and wait for it to finish.
Verify everything works
- First, restart Jupyter Lab completely (close the browser tab and stop the server in your terminal, then start it again).
- Run jupyter --version once more—you should now see an actual version number next to ipywidgets instead of "not installed".
- To test the widgets themselves, create a new Jupyter Notebook and run this code:
```
import ipywidgets as widgets
widgets.IntSlider()
```
If a slider widget shows up in your notebook, you're good to go!