A tool and pre-commit hook to automatically apply the awesome walrus operator.

pip install auto-walrus

See pre-commit for instructions

Sample .pre-commit-config.yaml:

-   repo: https://github.com/MarcoGorelli/auto-walrus
    rev: v0.2.2
    hooks:
    -   id: auto-walrus

auto-walrus myfile.py

-    n = 10
-    if n > 3:
+    if (n := 10) > 3:
         print(n)

Using the walrus operator can result in longer lines. Lines longer than what you pass to --line-length won't be rewritten to use walrus operators.

E.g.

auto-walrus myfile_1.py myfile_2.py --line-length 89

Lines with comments won't be rewritten.

To my great surprise, this is being used by:

• https://github.com/python-graphblas/python-graphblas
• https://github.com/Remi-Gau/bids2cite
• https://github.com/TheAlgorithms/Python

Anyone else? Please let me know, or you can open a pull request to add yourself.

Christopher Redwine, Senior Software Engineer at TechnologyAdvice

hmm, i dunno about this one chief

Michael Kennedy & Brian Okken, hosts of the Python Bytes podcast:

I kind of like this being separate from other tools

Someone on Discord

you're a monster

Will McGugan, CEO / Founder of http://Textualize.io:

Embrace the Walrus!

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