Unable to render Altair plot using boxplot on repeat with mimetype

[SonQBChau]

Applies To

• Notebooks (.ipynb files)
• Interactive Window and/or Cell Scripts (.py files with #%% markers)

What happened?

Issue description

Jupyter in VSCode is unable to render the Altair plot. This happens when using boxplot on repeat and set the renderer to mimetype

Steps to reproduce the issue

import altair as alt
from vega_datasets import data

# Show an image where the interactive plot is not supported
alt.renderers.enable('mimetype')

source = data.cars()

alt.Chart(source).mark_boxplot().encode(
    x='Origin',
    y=alt.Y(alt.repeat('column'), type='quantitative'),
).repeat(column=['Horsepower', 'Weight_in_lbs'])

What's the actual result?

TypeError: e.map is not a function

Additional details / screenshot

Altair Package Version

4.1.0

VS Code Version

Version: 1.61.2 Commit: 6cba118ac49a1b88332f312a8f67186f7f3c1643 Date: 2021-10-19T15:03:09.437Z Electron: 13.5.1 Chrome: 91.0.4472.164 Node.js: 14.16.0 V8: 9.1.269.39-electron.0 OS: Darwin arm64 20.6.0

Jupyter Extension Version

v2021.9.1101343141

Jupyter logs

TypeError: e.map is not a function

Coding Language and Runtime Version

Python v3.9.7 64-bit

Language Extension Version (if applicable)

No response

Anaconda Version (if applicable)

No response

Running Jupyter locally or remotely?

Local

[DonJayamanne]

Thanks for reporting this issue, I can repro this at my end.

[DonJayamanne]

Please use default as the mime renderer, (mime doesn't work in Jupyter lab either)
you can find more documentation here https://altair-viz.github.io/user_guide/custom_renderers.html

[SonQBChau]

I tried the code on Jupyter lab and it displayed normally, so mine type works on Jupyter lab

Here is the env:

altair==4.1.0
altair-data-server==0.4.1
altair-saver==0.5.0
altair-viewer==0.3.0
jupyterlab==3.2.0

[DonJayamanne]

Interesting that option is not documented on that list https://altair-viz.github.io/user_guide/custom_renderers.html

[joelostblom]

@DonJayamanne The docs have not been built in a while but you can see the full list in the repo:

• https://github.com/altair-viz/altair/blob/master/doc/user_guide/custom_renderers.rst
• https://github.com/altair-viz/altair/blob/master/doc/user_guide/display_frontends.rst

[DonJayamanne]

Thanks, will see what needs to be done at our end.
Hopefully just an update of the altair/vega or simiarl packages (used by us) should suffice.

[DonJayamanne]

Fixed,

Testing instructions:

• Install latest VS Code Insiders, Jupyter pre-release and Notebook renderers extension
• Install the following python packages
  pip install altair, vega, vega-datasets
• Run a cell in a notebook

import altair as alt
from vega_datasets import data

# Show an image where the interactive plot is not supported
alt.renderers.enable('mimetype')

source = data.cars()

alt.Chart(source).mark_boxplot().encode(
    x='Origin',
    y=alt.Y(alt.repeat('column'), type='quantitative'),
).repeat(column=['Horsepower', 'Weight_in_lbs'])

• Plot should appear