virtual environment policy

May I suggest clarifying what the installation procedure is when working with several environments?

Should ipympl be installed in the environment where jupyter resides or in the environment where it will be used?

Similar for the labextension install commands?

I have jupyter installed on a separate pyenv (based on kernel 3.7.5) that is made global.
When creating a new environment where I want to use %pylab widget, I need to run:

pyenv virtualenv 3.7.5 test-ipympl
pyenv activate test-ipympl 
pip install ipykernel
ipython kernel install --use --name="test-ipympl"
pip install matplotlib
pip install ipympl

Then I need to refresh the browser and restart any kernel running on test-ipympl environment

Is this the correct way to do it?

Revisa el procedimiento de instalación, separa los entornos de Jupyter y del kernel, así como los comandos de instalación de la labextension descritos en el issue. Confirma la configuración compatible con ipympl y documenta los comandos necesarios y los pasos para reiniciar o actualizar, de modo que los usuarios puedan instalarlo en un entorno separado sin tener que adivinar.