Error when running the Urban Growth Model

When I try to run the scripts in Jupyter Notebook for the Urban Growth Model, I get an error having to do with the UrbanCell class--see the screenshot:

I ran the space.py text first in Jupyter; then when I tried to import parts of the model script, and %run UrbanGrowthSpace.ipynb, it threw an error. Is this because the class name shares a name with one of the attributes?


I really appreciate any help you can provide. Sorry if this is confusing.

Start by running space.py and then UrbanGrowthSpace.ipynb in Jupyter, capturing the full traceback rather than relying on the screenshots. Inspect the UrbanCell class and the model script around the failing import or execution; the issue is done when the Urban Growth Model notebook runs without the reported error.

Written by the indexing model from the issue text.