Can you break this reacursion?

Question

I don't understand what is going on.

https://code.sololearn.com/cJikArN95wl4/?ref=app

Answer 1

If you don't work on an IDE with a debugger, you can use an online service which can do this. Debugging can be done visually and you can see output and content of variables. Copy your code and paste it in:
http://www.pythontutor.com/visualize.html#
There are some restrictions, but nevertheless it's a great tool.

Answer 2

~ swim ~ this time you really taught me something