Script to list non-standard modules imported by Jupyter notebooks. Run this in a directory containing `.ipynb` files and it will generate a `requirements-unpinned-tocheck.txt` file.

list-requirements.py

from pathlib import Path
import json
import re
import imp
import os.path
import sys

python_path = os.path.dirname(sys.executable).replace('bin', 'lib')

imports = []
for nb in Path.cwd().glob('*.ipynb'):
    if not nb.name.startswith('.') and not nb.name.startswith('Untitled'):
        nb_json = json.loads(nb.read_bytes())
        for cell in nb_json['cells']:
            for line in cell['source']:
                if match := re.search(r'^\s*import ([a-zA-Z_]+)(?! from)', line):
                    imports.append(match.group(1))
                elif match := re.search(r'^\s*import [a-zA-Z_\.]+ from ([a-zA-Z_]+)', line):
                    imports.append(match.group(1))

external_imports = ['jupyterlab\n']
for imported_mod in list(set(imports)):
    module_path = imp.find_module(imported_mod)[1]
    if module_path:
        if 'site-packages' in module_path or python_path in module_path:
            external_imports.append(imported_mod + '\n')
#print(external_imports)

with Path('requirements-unpinned-tocheck.txt').open('w') as req_file:
    req_file.writelines(external_imports)