IPython Notebook ipywidgets does not show

With the new version of ipywidgets, I ran into this problem, but then I found on their github readme that you now need to follow

pip install ipywidgets

with

jupyter nbextension enable --py widgetsnbextension

Note: To those using virtual environments (including conda environments) the recommended way to activate the extension is to run

jupyter nbextension enable --py --sys-prefix widgetsnbextension

That cleared the problem up for me.

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