Switch code formatter from Black to Ruff#547
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MaxGhenis merged 2 commits intoPolicyEngine:masterfrom Mar 6, 2026
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Replace black and linecheck with ruff for code formatting: - Remove black[jupyter] and linecheck dependencies, add ruff>=0.9.0 - Update Makefile format target to use ruff format - Replace lgeiger/black-action in CI with ruff format --check - Add [tool.ruff] config with line-length=88 to pyproject.toml - Add towncrier changelog fragment - Reformat all files with ruff Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
black[jupyter]andlinecheckdependencies frompyproject.toml, addruff>=0.9.0formattarget to useruff format .lgeiger/black-actionin CI workflows (pr.yaml, push.yaml) withruff format --check .[tool.ruff] line-length = 88config topyproject.tomlTest plan
ruff format --check .passes locallymake formatworks correctly with ruffGenerated with Claude Code