wiki/jupyterlab-import/README.md

tree

.
├── util.ipynb
├── util.py
└── workdir
    └── main.ipynb

util.py

get_ipython().run_line_magic("run", "../util.ipynb")

util.ipynb

In [1]: import numpy as np

workdir/main.ipynb

In [1]: run ../util
In [2]: np.arange(5)
Out[2]: array([0, 1, 2, 3, 4])