Homework: toggling using my solutions vs your solutions

[williamgilpin]

In the four homework notebooks, you have the option of using my solutions to check your work. In each notebook, there is a line that says something like this

## Import William's solution from answer key
from solutions.sandpile import AbelianSandpile

This works just like a Python import, but here it is importing local code from this repository instead of a package. You should comment out these lines, and then either run the cell where you define your code, or restart the notebook, to ensure that you are using your solutions.