Migrate from pip to uv for dependency management (#447)

* Migrate from legacy installer to uv for dependency management

Replace legacy installer with uv across Makefile and CI workflows:
- Makefile: use uv for package installation
- pr.yaml: Add setup-uv action to Test and SmokeTest jobs
- push.yaml: Add setup-uv action to versioning, Test, and Publish jobs

Lint jobs already used uv (via uvx ruff). This completes the migration.

Supersedes #431.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Add --system flag to uv pip install in Makefile

CI runners use system Python without a venv, so uv needs --system.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: MaxGhenis

.github/workflows/pr.yaml

@@ -45,6 +45,8 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
       - name: Install package
         run: make install
       - name: Run tests
@@ -70,23 +72,25 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
       - name: Install -core package
         run: |
-          python -m pip install .
-          python -m pip install "pytest-rerunfailures>=10,<15"
+          uv pip install --system .
+          uv pip install --system "pytest-rerunfailures>=10,<15"
       - name: Verify pytest plugins
         run: python -m pytest --version
       - name: Install -us package from PyPI
         run: |
           if [[ "${{ matrix.python-version }}" == "3.13" || "${{ matrix.python-version }}" == "3.14" ]]; then
             # For Python 3.13+, install newer tables first and ignore conflicts
-            pip install "tables>=3.11.0"
-            pip install policyengine-us --no-deps
+            uv pip install --system "tables>=3.11.0"
+            uv pip install --system policyengine-us --no-deps
             # Install remaining dependencies manually (skip pytest-dependency which has build issues)
-            pip install click pathlib synthimpute tabulate
-            pip install policyengine-us-data --no-deps
+            uv pip install --system click pathlib synthimpute tabulate
+            uv pip install --system policyengine-us-data --no-deps
           else
-            python -m pip install policyengine-us
+            uv pip install --system policyengine-us
           fi
         shell: bash
       - name: Run smoke tests only

.github/workflows/push.yaml

@@ -28,9 +28,11 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: "3.14"
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
       - name: Build changelog
         run: |
-          pip install towncrier
+          uv pip install --system towncrier
           python .github/bump_version.py
           towncrier build --yes --version $(python -c "import re; print(re.search(r'version = \"(.+?)\"', open('pyproject.toml').read()).group(1))")
       - name: Preview changelog update
@@ -54,6 +56,8 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: "3.14"
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
       - name: Install package
         run: make install
       - name: Run tests
@@ -80,6 +84,8 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: "3.14"
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
       - name: Publish a git tag
         run: ".github/publish-git-tag.sh || true"
       - name: Install package

Makefile

@@ -10,7 +10,7 @@ format:
 	ruff check .
 
 install:
-	pip install -e ".[dev]" --config-settings editable_mode=compat
+	uv pip install --system -e ".[dev]" --config-settings editable_mode=compat
 
 test-country-template:
 	policyengine-core test policyengine_core/country_template/tests -c policyengine_core.country_template

changelog.d/migrate-to-uv.changed.md

@@ -0,0 +1 @@
+Migrate from pip to uv for dependency management in Makefile and CI workflows.