I was trying to import a jupyter ipynb file. I didn't have conda or miniconda installed, but I did have just plain python 3.7 installed.

When I open the ipynb file I am promped to import it, but when I do so nothing happens. Nothing, no messages, no output.

When I added %##, I got the Run Cell widget. Clicking on it popped up a message box telling me that jupyter couldn't be found.

I installed mini-conda and then jupyter and now importing works.