Javascript Error: IPython is not defined in JupyterLab

问题

I have the latest/updated Anaconda package. Everytime I try to plot something using python 3.6.6 I get the following error in JupyterLab...

Javascript Error: IPython is not defined

When I run the same code in Spyder using an ipython kernel, it works just fine. Have been looking all over online but cant seem to figure out what is going on. Any help would be appreciated.

回答1:

"%matplotlib notebook doesn't work in nteract, you'll need to use %matplotlib inline for now."

Add:

    %matplotlib inline

Before plot the graph.

Quoted from

回答2:

Jupyter Lab does support interactive matplotlib through the jupyter-matplotlib extension. The installation procedure is slightly more involved, but works fine.

As before, it is important to invoke the iPython magic command before plotting:

Usage:

%matplotlib widget

Installation:

Using conda

conda install -c conda-forge ipympl
# If using the Notebook
conda install -c conda-forge widgetsnbextension
# If using JupyterLab
conda install nodejs
jupyter labextension install @jupyter-widgets/jupyterlab-manager
jupyter labextension install jupyter-matplotlib

Using pip

pip install ipympl
# If using JupyterLab
conda install nodejs
jupyter labextension install @jupyter-widgets/jupyterlab-manager
jupyter labextension install jupyter-matplotlib

回答3:

Need to use %matplotlib inline with JupyterLab

%matplotlib inline 
import matplotlib.pyplot as plt
plt.plot([1,2,3])

来源：https://stackoverflow.com/questions/51922480/javascript-error-ipython-is-not-defined-in-jupyterlab