a flake8 plugin from scratch (intermediate)

Today I build a flake8 plugin from scratch showing the bare minimum to add a new lint check! I also demo all the related tools I use to make this happen: astpretty, pytest, flake8, and a little bit of python packaging!

Setup commands

virtualenv venv

. venv/bin/activate

pip install flake8 pytest astpretty

Interactive examples

Python

import importlib.metadata
importlib.metadata.version('flake8_named_arguments')

'foo'.isidentifier()
'foo-bar'.isidentifier()

Bash

pip install -e .
flake8 --help
pytest tests
astpretty /dev/stdin <<< "f(**{'foo': 'bar'})"
astpretty --no-show-offsets /dev/stdin <<< "f(**{'foo': 'bar'})"
astpretty --no /dev/stdin <<< "f(**{'foo': 'bar'})"