Switch from black to ruff format

.github/bump_version.py

@@ -19,9 +19,7 @@ def get_current_version(pyproject_path: Path) -> str:
 
 def infer_bump(changelog_dir: Path) -> str:
     fragments = [
-        f
-        for f in changelog_dir.iterdir()
-        if f.is_file() and f.name != ".gitkeep"
+        f for f in changelog_dir.iterdir() if f.is_file() and f.name != ".gitkeep"
     ]
     if not fragments:
         print("No changelog fragments found", file=sys.stderr)

.github/workflows/pr.yaml

@@ -7,10 +7,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
       - name: Check formatting
-        uses: "lgeiger/black-action@master"
-        with:
-          args: ". -l 79 --check"
+        run: uvx ruff format --check .
   check-changelog:
     name: Check changelog fragment
     runs-on: ubuntu-latest

.github/workflows/push.yaml

@@ -10,10 +10,10 @@ jobs:
       && (github.event.head_commit.message == 'Update PolicyEngine Core')
     steps:
       - uses: actions/checkout@v4
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
       - name: Check formatting
-        uses: "lgeiger/black-action@master"
-        with:
-          args: ". -l 79 --check"
+        run: uvx ruff format --check .
   versioning:
     name: Update versioning
     if: |

Makefile

@@ -6,7 +6,7 @@ documentation:
 	python docs/add_plotly_to_book.py docs/_build
 
 format:
-	black . -l 79
+	ruff format .
 
 install:
 	pip install -e ".[dev]" --config-settings editable_mode=compat

README.md

@@ -2,7 +2,7 @@
 
 [![codecov](https://codecov.io/gh/PolicyEngine/policyengine-core/branch/master/graph/badge.svg?token=BLoCjCf5Qr)](https://codecov.io/gh/PolicyEngine/policyengine-core)
 [![PyPI version](https://badge.fury.io/py/policyengine-core.svg)](https://badge.fury.io/py/policyengine-core)
-[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
+[![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff)
 
 This package, a fork of [OpenFisca-Core](https://github.com/OpenFisca/OpenFisca-Core), powers PolicyEngine country models and apps.
 
@@ -64,7 +64,7 @@ We also ask that you add tests for any new features or bug-fixes you add, so we
 
 ### Step 2: Formatting
 
-In addition to the tests, we use [Black](https://github.com/psf/black) to lint our codebase, so before opening a pull request, Step 2 is to lint the code by running
+In addition to the tests, we use [Ruff](https://github.com/astral-sh/ruff) to format our codebase, so before opening a pull request, Step 2 is to format the code by running
 
 ```
 make format

changelog.d/switch-to-ruff.changed.md

@@ -0,0 +1 @@
+Switched code formatter from black to ruff format.

docs/usage/datasets.ipynb

@@ -39,9 +39,7 @@
     "    # Specify metadata used to describe and store the dataset.\n",
     "    name = \"country_template_dataset\"\n",
     "    label = \"Country template dataset\"\n",
-    "    file_path = (\n",
-    "        COUNTRY_DIR / \"data\" / \"storage\" / \"country_template_dataset.h5\"\n",
-    "    )\n",
+    "    file_path = COUNTRY_DIR / \"data\" / \"storage\" / \"country_template_dataset.h5\"\n",
     "    data_format = Dataset.TIME_PERIOD_ARRAYS\n",
     "\n",
     "    # The generation function is the most important part: it defines\n",