IPyWidgets not displaying when using a Python 2 kernel

[ojarjur]

When trying to use ipywidgets in a notebook with a Python 2 kernel, the widget does not display.

For example, if I run the following code cell:

import ipywidgets as widgets
widgets.IntSlider()

... then the following error message is output:

Failed to display Jupyter Widget of type IntSlider.

If you're reading this message in the Jupyter Notebook or JupyterLab Notebook, it may mean that the widgets JavaScript is still loading. If this message persists, it likely means that the widgets JavaScript library is either not installed or not enabled. See the Jupyter Widgets Documentation for setup instructions.

If you're reading this message in another frontend (for example, a static rendering on GitHub or NBViewer), it may mean that your frontend doesn't currently support widgets.

Digging in, I found the following error message in the Javascript console: Timeout while trying to cross validate the widget frontend and backend versions.

Digging in a little further, it looks like the version of ipywidgets installed in the python 2 environment is "7.1.2", whereas in the python 3 environment it is "6.0.1".

At the very least, we should make the versions match. If that does not resolve the issue, then we should dig deeper and figure out what else is wrong.

[ojarjur]

It looks like this was user error on my part. I had installed a library in the Python 2 environment that explicitly required ipywidgets>=7.0*

We may want to consider upgrading the version of ipywidgets we install by default, but this is not a bug in Kubeflow.