Switch typing from mypy to ty

docs/source/changes.md

@@ -6,8 +6,9 @@ them in reverse chronological order.
 ## Unreleased
 
 - {pull}`70` drops support for Python 3.9 and adds support for Python 3.14.
-- {pull}`73` removes tox in favor of uv + just.
+- {pull}`71` switches typing from mypy to ty.
 - {pull}`72` updates the pre-commit hooks.
+- {pull}`73` removes tox in favor of uv + just.
 
 ## 1.8.0 - 2024-12-24
 

justfile

@@ -12,7 +12,7 @@ test-cov:
 
 # Run type checking
 typing:
-    uv run --extra typing --extra test mypy
+    uv run --extra typing --extra test ty check hooks/ tests/
 
 # Run linting and formatting
 lint:

pyproject.toml

@@ -36,7 +36,7 @@ docs = [
     "sphinxext-opengraph",
 ]
 test = ["pytest", "pytest-cookies", "pytest-cov"]
-typing = ["mypy"]
+typing = ["ty>=0.0.7"]
 
 [project.readme]
 file = "README.md"
@@ -52,21 +52,11 @@ Documentation = "https://cookiecutter-pytask-project.readthedocs.io/en/latest"
 Github = "https://github.com/pytask-dev/cookiecutter-pytask-project"
 Tracker = "https://github.com/pytask-dev/cookiecutter-pytask-project/issues"
 
-[tool.mypy]
-files = ["hooks", "tests"]
-exclude = "{{cookiecutter.project_slug}}"
-check_untyped_defs = true
-disallow_any_generics = true
-disallow_incomplete_defs = true
-disallow_untyped_defs = true
-no_implicit_optional = true
-warn_redundant_casts = true
-warn_unused_ignores = true
+[tool.ty.rules]
+unused-ignore-comment = "error"
 
-[[tool.mypy.overrides]]
-module = "tests.*"
-disallow_untyped_defs = false
-ignore_errors = true
+[tool.ty.terminal]
+error-on-warning = true
 
 [tool.ruff]
 fix = true

tests/__init__.py

@@ -1 +1 @@
-"""This module is necessary to configure mypy's behavior for the tests."""
+"""Mark tests as a package for type checking."""

tests/test_cookie.py

@@ -90,20 +90,20 @@ def test_check_pixi_and_run_all_checks(cookies):
         check=True,
     )
 
-    # Install pre-commit.
+    # Install prek.
     subprocess.run(
-        ("pixi", "global", "install", "pre-commit"),
+        ("pixi", "global", "install", "prek"),
         cwd=result.project_path,
         check=True,
     )
     # Check linting, but not on the first try since formatters fix stuff.
     subprocess.run(
-        ("pixi", "run", "pre-commit", "run", "--all-files"),
+        ("pixi", "run", "prek", "run", "--all-files"),
         cwd=result.project_path,
         check=False,
     )
     subprocess.run(
-        ("pixi", "run", "pre-commit", "run", "--all-files"),
+        ("pixi", "run", "prek", "run", "--all-files"),
         cwd=result.project_path,
         check=True,
     )

{{cookiecutter.project_slug}}/pyproject.toml

@@ -69,10 +69,10 @@ pytest-cov = "*"
 pytest-xdist = "*"
 
 [tool.pixi.feature.typing.tasks]
-typing = "mypy"
+typing = "ty check src/ tests/"
 
 [tool.pixi.feature.typing.dependencies]
-mypy = "*"
+ty = ">=0.0.7"
 
 [tool.pixi.feature.dev.tasks]
 nb = "jupyter lab --no-browser"
@@ -87,21 +87,11 @@ docs = { features = ["docs"], solve-group = "default" }
 repro = { features = [], solve-group = "default" }
 typing = { features = ["typing"], solve-group = "default" }
 
-[tool.mypy]
-files = ["src", "tests"]
-check_untyped_defs = true
-disallow_any_generics = true
-disallow_incomplete_defs = true
-disallow_untyped_defs = true
-no_implicit_optional = true
-warn_redundant_casts = true
-warn_unused_ignores = true
-ignore_missing_imports = true
-
-[[tool.mypy.overrides]]
-module = "tests.*"
-ignore_errors = true
-disallow_untyped_defs = false
+[tool.ty.rules]
+unused-ignore-comment = "error"
+
+[tool.ty.terminal]
+error-on-warning = true
 
 [tool.pytask.ini_options]
 paths = ["src/{{ cookiecutter.project_slug }}"]

{{cookiecutter.project_slug}}/src/{{cookiecutter.project_slug}}/__init__.py

@@ -4,7 +4,7 @@
 # when the project is installed with ``pip install -e .``. Do not put it into version
 # control!
 try:
-    from ._version import version as __version__
+    from ._version import version as __version__  # ty: ignore[unresolved-import]
 except ImportError:
     __version__ = "unknown"
 

{{cookiecutter.project_slug}}/tests/__init__.py

@@ -1 +1 @@
-"""Is module is necessary to configure mypy's behavior for the tests."""
+"""Mark tests as a package for type checking."""