If no path is passed to notebook, use this trick

[johnjosephhorton]

import os
from pathlib import Path

def get_latest_notebook():
    """
    Returns the path to the most recently modified .ipynb file in the current directory.
    Returns None if no .ipynb files are found.
    """
    # Get all ipynb files in current directory
    notebook_files = list(Path('.').glob('*.ipynb'))
    
    if not notebook_files:
        return None
    
    # Get the most recent file based on modification time
    latest_notebook = max(notebook_files, key=lambda x: x.stat().st_mtime)
    
    return latest_notebook

# Example usage:
# latest_nb = get_latest_notebook()
# if latest_nb:
#     print(f"Most recent notebook: {latest_nb}")
# else:
#     print("No notebook files found")