Ipywidgets VBox not displaying in notebook

I tried the single slider example in here https://plot.ly/python/slider-widget/.

But the widget was not showing. But displaying ipywidget itself seems to be fine.

Hi @wangziheng,

It looks like you may be working in JupyterLab. If so, double check that the versions of all of the Python and JupyterLab packages you have installed match the installation instructions at https://github.com/plotly/plotly.py#installation.

Hope that helps,