Squeaky

✨ Make your Jupyter notebooks squeaky clean ✨

Squeaky removes unwanted changes to your notebooks to make your Git diffs cleaner. Tools like nbdime and ReviewNB are awesome, but can be clunky and difficult to learn. Instead, Squeaky makes it easier to manage notebook diffs with standard Git tools.

Usage

First, install:

pip install squeaky

Then use Squeaky to clean a notebook:

squeaky path/to/notebook(s).ipynb

To check notebooks without modifying them, use the --check flag.

squeaky path/to/notebook.ipynb --check

Jupyter pre-save hook

You can automatically run your notebooks through Squeaky before saving them by editing your Jupyter config file. First, find the location of your config directory by running

jupyter --config-dir

Your config directory may contain either a jupyter_lab_config.py or a jupyter_server_config.py (if neither exists, create an empty file with either of these names).

⚠️ If you're using Jupyter notebook < 7, then the file will be called jupyter_notebook_config.py.

Then, add the following lines to that config file.

from squeaky import squeaky_clean_hook
c.FileContentsManager.pre_save_hook = squeaky_clean_hook

Pre-commit hook

To use with pre-commit, add the following to your .pre-commit-config.yaml.

repos:
  - repo: local
    hooks:
      - name: Clean notebooks
        id: clean-notebooks
        entry: squeaky --check
        language: python
        files: '(.*?).ipynb$'

Features

• Reset metadata

  If you're running your notebooks in CI, then you probably don't care about the last environment a notebook was edited in. Squeaky resets notebook metadata to a standard metadata.

• Minify SVGs

  Setting code image outputs to SVGs makes images look great, but comes with horrendous diffs. Squeaky minifies SVG outputs to a single line, which also reduces file size.

• Reset IDs in SVG outputs

  SVG outputs have another problem: Randomized IDs in the source. Squeaky re-generates these IDs deterministically using on the cell's unique ID. This means re-running the notebook won't change the output unless the image actually changes.

• Remove trailing whitespace

  Often missed in markdown (but not in version control), Squeaky removes trailing whitespace from ends of lines and empty lines from ends and beginnings of cells.

• Remove empty cells

  Squeaky removes empty cells, including that annoying empty code cell at the bottom of every other notebook.

• Add missing cell IDs

  Cells without IDs now raise a warning in nbformat. Squeaky adds these IDs for you so you don't need to think about it.

Contributing

To install requirements and add pre-commit hooks:

pip install -r requirements-dev.txt
pre-commit install

To run unit tests (also run on commit):

tox

Wishlist

• Turn off features through config file