numpy.core.multiarray fails to import with current setup instructions

[aldeka]

(Feel free to ignore, this isn't a blocking issue for me anymore)

I was following the setup instructions for Puzzlord on my local dev machine. The rest of the steps worked normally, but when I did python manage.py migrate for the first time I got:

<cut for length>
  File "/Users/aldeka/Code/puzzlord/puzzle_editing/urls.py", line 7, in <module>
    from . import views
  File "/Users/aldeka/Code/puzzlord/puzzle_editing/views.py", line 34, in <module>
    from puzzle_editing.graph import curr_puzzle_graph_b64
  File "/Users/aldeka/Code/puzzlord/puzzle_editing/graph.py", line 7, in <module>
    import matplotlib
  File "/Users/aldeka/Code/puzzlord/venv/lib/python3.9/site-packages/matplotlib/__init__.py", line 174, in <module>
    _check_versions()
  File "/Users/aldeka/Code/puzzlord/venv/lib/python3.9/site-packages/matplotlib/__init__.py", line 159, in _check_versions
    from . import ft2font
ImportError: numpy.core.multiarray failed to import
(venv) aldeka@agaetis puzzlord %

I tried manually installing pip3 install numpy but it said it was already there: Requirement already satisfied: numpy in ./venv/lib/python3.9/site-packages (1.19.1)

This is on an Intel-based Mac running Big Sur (11.6.2) with pip version 21.3.1 and Python 3.9.9.

After googling a bit I found someone recommended running pip install -U numpy instead. This upgraded to numpy-1.22.1. The migrations worked thereafter and I was able to start the django server.

I don't know why that solved the problem, but I guess maybe the requirements.txt needs updating? I wouldn't want to break it for others though, if that's a risk.