fixes up jupyter notebook widgets state so GitHub can visualize notebooks again

fix_notebook.py

# Usage: python fix_notebook.py <.ipynb file> 
# WARNING: this overwrites the file, so save a backup first 

# To execute on a whole folder of files, run this bash command: 
# find . -name "*.ipynb" -exec python fix_notebook.py {} \;

import json
import sys

def fix_notebook(filename):
    with open(filename, 'r') as f:
        nb = json.load(f)
    
    # Remove metadata.widgets entirely (safest approach)
    if 'metadata' in nb and 'widgets' in nb['metadata']:
        del nb['metadata']['widgets']
    
    with open(filename, 'w') as f:
        json.dump(nb, f, indent=2)
    
    print(f"Fixed {filename}")

# Usage: python fix_notebook.py notebook.ipynb
if __name__ == "__main__":
    fix_notebook(sys.argv[1])