feat!: drop Python 3.8 support (#874)

* feat!: remove support for Python 3.8

* chore: run `pre-commit run -a`

* chore: handle `TCH` violations

.github/workflows/main.yml

@@ -57,7 +57,7 @@ jobs:
             image: macos-14
           - name: windows
             image: windows-2022
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13-dev', 'pypy3.10']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13-dev', 'pypy3.10']
       fail-fast: false
     runs-on: ${{ matrix.os.image }}
     name: ${{ matrix.os.name }} (${{ matrix.python-version }})

Cargo.toml

@@ -14,7 +14,7 @@ encoding_rs = "=0.8.34"
 ignore = "=0.4.23"
 log = "=0.4.22"
 path-slash = "=0.2.1"
-pyo3 = { version = "=0.22.3", features = ["abi3-py38", "generate-import-lib"] }
+pyo3 = { version = "=0.22.3", features = ["abi3-py39", "generate-import-lib"] }
 pyo3-log = "=0.11.0"
 rayon = "=1.10.0"
 regex = "=1.10.6"

pyproject.toml

@@ -4,7 +4,7 @@ version = "0.0.1"
 description = "A command line utility to check for unused, missing and transitive dependencies in a Python project."
 authors = [{ name = "Florian Maas", email = "[email protected]" }]
 maintainers = [{ name = "Mathieu Kniewallner", email = "[email protected]" }]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 license = { file = "LICENSE" }
 classifiers = [
     "Development Status :: 3 - Alpha",
@@ -13,7 +13,6 @@ classifiers = [
     "Topic :: Software Development :: Libraries :: Python Modules",
     "Topic :: Software Development :: Quality Assurance",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",

python/deptry/dependency_getter/builder.py

@@ -3,7 +3,7 @@
 import logging
 from dataclasses import dataclass, field
 from pathlib import Path
-from typing import TYPE_CHECKING, Mapping
+from typing import TYPE_CHECKING
 
 from deptry.dependency_getter.pep621.base import PEP621DependencyGetter
 from deptry.dependency_getter.pep621.pdm import PDMDependencyGetter
@@ -14,6 +14,7 @@
 from deptry.utils import load_pyproject_toml
 
 if TYPE_CHECKING:
+    from collections.abc import Mapping
     from typing import Any
 
     from deptry.dependency_getter.base import DependencyGetter

python/deptry/exceptions.py

@@ -24,7 +24,7 @@ def __init__(self, directory: Path) -> None:
 class UnsupportedPythonVersionError(ValueError):
     def __init__(self, version: tuple[int, int]) -> None:
         super().__init__(
-            f"Python version {version[0]}.{version[1]} is not supported. Only versions >= 3.8 are supported."
+            f"Python version {version[0]}.{version[1]} is not supported. Only versions >= 3.9 are supported."
         )
 
 

python/deptry/violations/finder.py

@@ -12,7 +12,7 @@
 )
 
 if TYPE_CHECKING:
-    from typing import Mapping
+    from collections.abc import Mapping
 
     from deptry.dependency import Dependency
     from deptry.module import ModuleLocations

tests/unit/dependency_getter/test_builder.py

@@ -136,11 +136,15 @@ def test_dependency_specification_not_found_raises_exception(tmp_path: Path, cap
         with pyproject_toml_path.open("w") as f:
             f.write('[build-system]\nrequires = ["maturin>=1.5,<2.0"]\nbuild-backend = "maturin"')
 
-    with caplog.at_level(logging.DEBUG), run_within_dir(tmp_path), pytest.raises(
-        DependencySpecificationNotFoundError,
-        match=re.escape(
-            "No file called 'pyproject.toml' with a [tool.poetry.dependencies], [tool.pdm] or [project] section or"
-            " file(s) called 'req/req.txt' found. Exiting."
+    with (
+        caplog.at_level(logging.DEBUG),
+        run_within_dir(tmp_path),
+        pytest.raises(
+            DependencySpecificationNotFoundError,
+            match=re.escape(
+                "No file called 'pyproject.toml' with a [tool.poetry.dependencies], [tool.pdm] or [project] section or"
+                " file(s) called 'req/req.txt' found. Exiting."
+            ),
         ),
     ):
         DependencyGetterBuilder(Path("pyproject.toml"), requirements_files=("req/req.txt",)).build()

tests/unit/test_core.py

@@ -174,10 +174,13 @@ def test__get_stdlib_packages_with_stdlib_module_names_future_version(version_in
 )
 def test__get_stdlib_packages_unsupported(version_info: tuple[int | str, ...]) -> None:
     """It should raise an error when Python version is unsupported."""
-    with mock.patch("sys.version_info", version_info), pytest.raises(
-        UnsupportedPythonVersionError,
-        match=re.escape(
-            f"Python version {version_info[0]}.{version_info[1]} is not supported. Only versions >= 3.8 are supported."
+    with (
+        mock.patch("sys.version_info", version_info),
+        pytest.raises(
+            UnsupportedPythonVersionError,
+            match=re.escape(
+                f"Python version {version_info[0]}.{version_info[1]} is not supported. Only versions >= 3.9 are supported."
+            ),
         ),
     ):
         Core._get_standard_library_modules()

tests/utils.py

@@ -10,11 +10,14 @@
 from contextlib import contextmanager
 from dataclasses import dataclass
 from pathlib import Path
-from typing import Any, Generator
+from typing import TYPE_CHECKING, Any
 
 from deptry.reporters.text import COLORS
 from tests.functional.utils import DEPTRY_WHEEL_DIRECTORY
 
+if TYPE_CHECKING:
+    from collections.abc import Generator
+
 
 @dataclass
 class _BaseVenvFactory:

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 skipsdist = true
-envlist = py38, py39, py310, py311, py312, py313
+envlist = py39, py310, py311, py312, py313
 
 [testenv]
 allowlist_externals = uv