%matplotlib widget not working in jupyter lab

[hasibzunair]

Running a cell in jupyter lab with %matplotlib widget results in:

Canvas(toolbar=Toolbar(toolitems=[('Home', 'Reset original view', 'home', 'home'), ('Back', 'Back to previous …
Running the cell more than once results in:

KeyError: '97acd0c8fb504a2288834b349003b4ae'

My environment:

• Python 3.6.8
• Matplotlib 3.0.3

[martinRenou]

What instructions did you follow for installing ipympl?

[hasibzunair]

Just pip install ipympl.

It works now after running the following bash commands.

conda install -y nodejs
pip install --upgrade jupyterlab
jupyter labextension install @jupyter-widgets/jupyterlab-manager
jupyter labextension install jupyter-matplotlib
jupyter nbextension enable --py widgetsnbextension

Edit: Must restart jupyter server after running these commands

[Nestak2]

Thanks, "restart" was the critical instruction for me. It wasn't enough the quit and start again jupyterlab in the terminal, only after restarting the computer the plots finally worked

[martinRenou]

Usually clearing the browser cache is the important step

[RGD2]

FWIW I had same problem, but had to avoid using conda, and was required to use virtual envs with python.
I was able to fix this by following nodejs's install instructions using a package manager. In my case this was ubuntu -- so using nodejs binary distributions from github.

This ended up being something like (in total):

mkvirtualenv -p python3.8 jupenv
pip install jupyter matplotlib pandas ipympl tqdm
curl -sL https://deb.nodesource.com/setup_10.x | sudo -E bash -
sudo apt-get install -y nodejs
jupyter labextension install @jupyter-widgets/jupyterlab-manager

Because of the venv, you later start jupyter with:

workon jupenv
jupyter lab

Hope this helps others.

[Mariveros]

Same problem here, restarting kernel not work for me. only when I restart jupyter lab from terminal it works. (%matplotlib widget)

[Samadarshi-Maity]

upgrade pip
add

pip install ipympl 

in anaconda prompt
and restart jupyter notebook