POC: exposing the watermark function outside Jupyter

[twolodzko]

This is a proof-of-concept PR.

I exposed the watermark() function, so that it also works outside Jupyter. Now the magic %watermark calls watermark() function. So now this works both outside and from Jupyter as magic function.

Changes in the behavior: new function get_imported_packages() is introduced, it prints more of the buildin packages then the initial code. At this moment I have no idea how this could be fixed.

The code obviously needs cleaning-up.

[pep8speaks]

Hello @twolodzko! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2021-02-18 16:35:35 UTC

[rasbt]

I am actually not sure what happened to this PR. Was/is this still work in progress? Would be happy to revisit.

[twolodzko]

@rasbt I also already forgot about this one 😆 No work is done on this. If it works, it works. If you want me to change something, feel free to comment.

[rasbt]

Thanks for the PR and note! I may have ignored this because I wasn't sure that it was ready and then forgot. Will put it onto my todo list again. Thanks!

[rasbt]

Alright! Just took this existing PR and patched it into the recent 2.1 version. It was a bit messy because we had a major refactoring back then, but I hope I didn't screw it up. There was also a consequent merge conflict, but on my end, now things seem to work :).

Maybe @twolodzko have a look if this looks good to merge. Would also appreciate a second pair of eyes, @jamesmyatt . Maybe after merging this we could finally add unit tests.

[twolodzko]

I have no comments, LGTM

[rasbt]

Great! I saw I had some installation cluttering so more fixes were required, but it should be all good now. Will merge and then replace Travis with Appveyor to run the first unittest. (Travis requires credits now, which are unfortunately consumed by other github repos so Travis would not be reliable here)