Add notebook extension for automatically adding imports to first cell

[valtron]

I made a notebook extension that automatically adds lazy imports to the top cell as they're imported:

How to use it:

1. Install pyforest from this branch: pip install git+https://github.com/valtron/pyforest.git@nbextension
2. jupyter nbextension install --py pyforest
3. jupyter nbextension enable pyforest --py
4. Run jupyter notebook and import some stuff

The implementation is hacky (this is my first notebook extension and documentation is lacking) but this is a proof-of-concept anyway.

[FlorianWetschoreck]

Wow, first of all, thank you for your contribution! It looks really nice and is a great improvement of pyforest!

Does the notebook extension also work for JupyterLab? Or what would be necessary to also make it work in Jupyter Lab?
It would be great to have support for both Jupyter Notebook and Jupyter Lab.

[valtron]

Glad you like it!

I added a labextension. But I'm still trying to figure out a convenient way for users to install it. (I've been using jupyter labextension install . from inside the project dir.)

[valtron]

Done, and added installation instructions to the README.

[valtron]

It's now using an "invisible" widget instead of the window.update_imports_cell hack. There's still a few major things I need to do:

• setup.py is from the widget cookiecutter, but it doesn't handle building the nbextension during install
• the widget isn't invisible in ipython
• delimit imports on both sides

[henryiii]

What's the status of this? Looks very useful in the demo, at least. :)

[valtron]

@henryiii All the major parts are finished; I never did figure out how to not show the widget in IPython, though: