intro tutorial: Remove unique_id from Agent init

[EwoutH]

Remove unique_id from the Agent init in the introduction tutorial, since unique_id is now automatically assigned in Mesa 3.0 and Mesa-geo 0.9.

Update after the changes in #248.

[EwoutH]

@tpike3 @wang-boyu I have a very specific question: The notebook had unique_id = "HOODNUM" defined in the class, and then unique_id=self.unique_id in the AgentCreator from_file() method. I think that meant that the HOODNUM column was assigned as the unique_id, right? How was that used and is it still needed? And isn't it also saved as an Agent attribute?

Please explain to how it's intended to work :)

Edit: I can confirm that HOODNUM is still saved as an attribute for Agents:

[wang-boyu]

I think that meant that the HOODNUM column was assigned as the unique_id, right?

That's right!

How was that used and is it still needed?

I don't think it's really used, but better confirm with @tpike3 for this tutorial.

[EwoutH]

For the Neighbourhood, I think I found an elegant solution of using the HOODNUM in the __repr__ method, so that it prints its HOODNUM from the data file.

    def __repr__(self):
        return f"Neighbourhood {self.HOODNUM}"

This was equivalent of the original behavior of assigning HOODNUM to unique_id and then printing unique_id.

I will give @tpike3 a chance to review and otherwise I will merge tonight.

[tpike3]

LGTM --- HOODNUM was taken from whoever made the model initially (Corvince?). I think you solution is very elegant.

[EwoutH]

Thanks!

Please don't merge my PRs though, I like to do that myself (in this case I would have liked to squash). An review and approve is really appreciated!