renderer issue after upgrading to v3

Love the package and the approach. I have successfully used version 2, but I am having renderer issues after upgrading to version 3. Perhaps my real problem is that I don’t use git and so don’t deeply understand version control and therefore don’t know where the documentation lives for version 3.

I am running altair 3.0.0rc1, jupyterlab 0.35.4, python 3.6.8

import altair as alt
alt.renderers.enable('jupyterlab')
cars=alt.datasets.load_dataset('cars')

alt.Chart(data=cars).mark_point().encode(
    x='Horsepower:Q',
    y='Miles_per_Gallon:Q'
)

gets me:

<VegaLite 3 object>

If you see this message, it means the renderer has not been properly enabled
for the frontend that you are using. For more information, see
https://altair-viz.github.io/user_guide/troubleshooting.html

The link goes to the version 2.4.1 documentation, which alludes to having at least jupyterlab 0.32, which I do.
My question probably betrays my shallow understanding, but hopefully there are other shy lurkers who I’m speaking for as well.

Many thanks in advance, Vinod

[jakevdp]

The Vega-Lite 3 renderer is built-in to JupyterLab, (added in https://github.com/jupyterlab/jupyterlab/pull/6133) but that addition has not yet made it into a release.

Until the next JupyterLab release, I’d suggest using Altair v3 with another frontend, such as Jupyter Notebook or Colab.

[jakevdp]

https://altair-viz.github.io/user_guide/troubleshooting.html#notebook-vegalite-3-object