Google Code-in

We have had a few good submissions to the basic Python debugger task:

https://codein.withgoogle.com/dashboard/tasks/5715053794295808/

They work well, but they have a problem: When just part of a variable is changed, they report the whole variable as having changed. Let's extend this a bit and make it smarter by adding this constraint:

For arrays, lists, etc, when there's a change, you need to report which element(s) have changed.