Migrate from mypy to ty

.github/workflows/test.yml

@@ -12,12 +12,13 @@ jobs:
       - uses: astral-sh/setup-uv@v3
         with:
           enable-cache: true
-          # Keep in sync with `Dockerfile`'s `builder`.
-          version: "0.5.6"
+          # Keep in sync with pyproject.toml's `tool.uv.required-version`.
+          version: "0.8.13"
+      # Keep in sync with pyproject.toml's `project.requires-python`.
       - run: uv python install 3.10
       - run: uv sync --locked
       - run: uv run -m skeleton
       - run: uv run ruff format --check
       - run: uv run ruff check
-      - run: uv run mypy
+      - run: uv run ty check
       - run: uv run pytest

.vscode/extensions.json

@@ -1,5 +1,6 @@
 {
     "recommendations": [
+        "astral-sh.ty",
         "charliermarsh.ruff",
         "ms-python.python",
         "tamasfe.even-better-toml"

Dockerfile

@@ -1,7 +1,10 @@
 # Inspired from https://github.com/astral-sh/uv-docker-example/blob/dee88a8c43be3b16b0ad58f0daee5eaee7e2157a/multistage.Dockerfile.
 
-# Keep in sync with `.github/workflows/test.yml`.
-FROM ghcr.io/astral-sh/uv:0.5.6-python3.10-bookworm-slim AS builder
+# Keep uv version in sync with pyproject.toml's `tool.uv.required-version`.
+# Keep Python version in sync with:
+# - pyproject.toml's `project.requires-python`.
+# - the main stage below.
+FROM ghcr.io/astral-sh/uv:0.8.13-python3.10-bookworm-slim AS builder
 
 ENV UV_COMPILE_BYTECODE=1 UV_LINK_MODE=copy
 
@@ -17,7 +20,7 @@ RUN --mount=type=bind,source=skeleton,target=skeleton_tmp \
     mv app/skeleton skeleton && \
     rm -r app
 
-# Keep this synced with the builder image.
+# Keep this synced with the `builder` stage above.
 FROM python:3.10-slim-bookworm
 
 COPY --from=builder /venv app

README.md

@@ -7,7 +7,7 @@ On top of the `atoti` package, it comes with:
 - Dependency management with [uv](https://docs.astral.sh/uv)
 - Config management with [Pydantic](https://docs.pydantic.dev/2.6/concepts/pydantic_settings)
 - Testing with [pytest](https://docs.pytest.org)
-- Type checking with [mypy](http://mypy-lang.org)
+- Type checking with [ty](https://docs.astral.sh/ty)
 - Formatting and linting with [Ruff](https://docs.astral.sh/ruff)
 - Continuous testing with [GitHub Actions](https://github.com/features/actions)
 

app/load_tables.py

@@ -30,7 +30,7 @@ async def read_station_details(
             http_client=http_client,
         ),
     )["data"]["stations"]
-    station_information_df = pd.DataFrame(stations_data)[
+    station_information_df = pd.DataFrame(stations_data)[  # ty: ignore[no-matching-overload]
         ["station_id", "name", "capacity", "lat", "lon"]
     ].rename(
         columns={

app/util/reverse_geocode.py

@@ -86,7 +86,7 @@ def _reverse_geocode(
 
     results_df = results_df.set_index(list(coordinates_df.columns))
     results_df = results_df.rename(columns=_COLUMN_NAME_MAPPING)
-    return results_df.to_dict("index")  # type: ignore[return-value]
+    return results_df.to_dict("index")
 
 
 def reverse_geocode(

pyproject.toml

@@ -1,16 +1,12 @@
 [dependency-groups]
-dev = [
-    "docker",
-    "mypy",
-    "pandas-stubs",
-    "pytest",
-    "pytest-asyncio",
-    "ruff",
-]
+dev = ["docker", "pandas-stubs", "pytest", "pytest-asyncio", "ruff", "ty"]
 
 [project]
 name = "app"
 version = "0.1.0"
+# Keep in sync with:
+# - .github/workflows/test.yml
+# - Dockerfile`'s `FROM` commands.
 requires-python = ">=3.10"
 dependencies = [
     "atoti[jdbc]",
@@ -22,17 +18,6 @@ dependencies = [
 ]
 
 
-[tool.mypy]
-files = "app,skeleton,tests" # Remove once https://github.com/python/mypy/issues/10428 is fixed.
-strict = true
-warn_redundant_casts = true
-warn_unused_configs = true
-warn_unused_ignores = true
-
-[[tool.mypy.overrides]]
-module = ["docker", "docker.*"]
-ignore_missing_imports = true
-
 [tool.pytest.ini_options]
 addopts = "--doctest-modules --strict-markers"
 asyncio_default_fixture_loop_scope = "session"
@@ -71,8 +56,20 @@ select = ["ALL"]
 banned-from = ["atoti", "pandas"]
 
 [tool.ruff.lint.flake8-import-conventions.aliases]
-atoti =  "tt"
+atoti = "tt"
 pandas = "pd"
 
 [tool.ruff.lint.isort]
 combine-as-imports = true
+
+[tool.ty.rules]
+unused-ignore-comment = "warn"
+
+[tool.ty.terminal]
+error-on-warning = true
+
+[tool.uv]
+# Keep in sync with:
+# - .github/workflows/test.yml
+# - Dockerfile`'s `builder`.
+required-version = ">=0.8.13"

tests/docker/conftest.py

@@ -21,8 +21,10 @@ def docker_bin_fixture() -> Path:
 
 
 @pytest.fixture(name="docker_client", scope="session")
-def docker_client_fixture() -> docker.DockerClient:
-    return docker.from_env()
+def docker_client_fixture() -> Generator[docker.DockerClient, None, None]:
+    client = docker.from_env()
+    yield client
+    client.close()
 
 
 @pytest.fixture(name="docker_image_name", scope="session")
@@ -76,3 +78,4 @@ def session_inside_docker_container_fixture(
         )
         session = tt.Session.connect(f"http://localhost:{host_port}")
         yield session
+        logs.close()