Useful Magic Commands for JupterLab

Shan Dou

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Jun 4, 2021

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1. nb_black: Black auto-formmater for Jupyter

• Installation (view on PyPI): pip install nb-black
• Usage: In top-cell magic in jupyter lab

%load_ext lab_black

• See also: Black code formatter

2. ipython-autotime: Time each code cell

• Installation (view on PyPI): pip install ipython-autotime
• Usage: In top-cell magic in jupyter lab

%load_ext autotime

3. autoreload: Reload imported modules

• Built-in (Docs)
• Usage: In top-cell magic in jupyter lab

%load_ext autoreload
%autoreload 2

• Example usage:

In [1]: %load_ext autoreload
In [2]: %autoreload 2
In [3]: from foo import some_function
In [4]: some_function()
Out[4]: 42
In [5]: # open foo.py in an editor and change some_function to return 43
In [6]: some_function()
Out[6]: 43