feat: drop Python 3.9

.github/workflows/ci.yml

@@ -23,14 +23,14 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
         python-version:
-          - "3.9"
-          - "3.11"
+          - "3.10"
+          - "3.12"
           - "3.14"
         include:
-          - os: ubuntu-22.04
-            python-version: "3.9"
           - os: ubuntu-22.04
             python-version: "3.11"
+          - os: ubuntu-22.04
+            python-version: "3.13"
           - os: macos-15-intel
             python-version: "3.12"
     steps:
@@ -41,8 +41,8 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: |
-            3.9
             3.10
+            3.11
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v6
         with:

nox/_decorators.py

@@ -18,7 +18,8 @@
 import functools
 import inspect
 import types
-from typing import TYPE_CHECKING, Any, Callable, Literal, TypeVar, cast
+from collections.abc import Callable
+from typing import TYPE_CHECKING, Any, Literal, TypeVar, cast
 
 if TYPE_CHECKING:
     from collections.abc import Iterable, Mapping, Sequence

nox/_option_set.py

@@ -47,7 +47,7 @@ def __dir__() -> list[str]:
 
 
 av_opt_str = av.optional(av.instance_of(str))
-av_opt_path = av.optional(av.or_(av.instance_of(str), av.instance_of(os.PathLike)))
+av_opt_path = av.optional(av.or_(av.instance_of(str), av.instance_of(os.PathLike)))  # type: ignore[type-abstract]
 av_opt_list_str = av.optional(
     av.deep_iterable(
         member_validator=av.instance_of(str),

nox/_options.py

@@ -21,7 +21,7 @@
 import itertools
 import os
 import sys
-from typing import TYPE_CHECKING, Any, Callable, Literal
+from typing import TYPE_CHECKING, Any, Literal
 
 import argcomplete
 
@@ -30,7 +30,7 @@
 from nox.virtualenv import ALL_VENVS
 
 if TYPE_CHECKING:
-    from collections.abc import Iterable, Sequence
+    from collections.abc import Callable, Iterable, Sequence
 
     from nox._option_set import NoxOptions
 

nox/_parametrize.py

@@ -17,7 +17,7 @@
 import functools
 import itertools
 from collections.abc import Iterable
-from typing import TYPE_CHECKING, Any, Union
+from typing import TYPE_CHECKING, Any
 
 if TYPE_CHECKING:
     from collections.abc import Callable, Sequence
@@ -64,7 +64,7 @@ def __init__(
 
     @property
     def call_spec(self) -> dict[str, Any]:
-        return dict(zip(self.arg_names, self.args))
+        return dict(zip(self.arg_names, self.args, strict=True))
 
     def __str__(self) -> str:
         if self.id:
@@ -96,7 +96,7 @@ def __eq__(self, other: object) -> bool:
                 and self.tags == other.tags
             )
         if isinstance(other, dict):
-            return dict(zip(self.arg_names, self.args)) == other
+            return dict(zip(self.arg_names, self.args, strict=True)) == other
 
         return NotImplemented
 
@@ -108,7 +108,7 @@ def _apply_param_specs(param_specs: Iterable[Param], f: Any) -> Any:
     return f
 
 
-ArgValue = Union[Param, Iterable[Any]]
+ArgValue = Param | Iterable[Any]
 
 
 def parametrize_decorator(

nox/_typing.py

@@ -15,7 +15,6 @@
 from __future__ import annotations
 
 from collections.abc import Sequence
-from typing import Union
 
 __all__ = ["Python"]
 
@@ -24,4 +23,4 @@ def __dir__() -> list[str]:
     return __all__
 
 
-Python = Union[str, Sequence[str], bool, None]
+Python = str | Sequence[str] | bool | None

nox/registry.py

@@ -17,7 +17,8 @@
 import copy
 import functools
 import warnings
-from typing import TYPE_CHECKING, Any, Callable, Literal, overload
+from collections.abc import Callable
+from typing import TYPE_CHECKING, Any, Literal, overload
 
 from ._decorators import Func
 

pyproject.toml

@@ -18,7 +18,7 @@ license = "Apache-2.0"
 authors = [
   { name = "Alethea Katherine Flowers", email = "[email protected]" },
 ]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 classifiers = [
   "Development Status :: 5 - Production/Stable",
   "Environment :: Console",
@@ -29,7 +29,6 @@ classifiers = [
   "Operating System :: Unix",
   "Programming Language :: Python",
   "Programming Language :: Python :: 3 :: Only",
-  "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
@@ -46,8 +45,7 @@ dependencies = [
   "packaging>=20.9; python_version<'3.10'",
   "packaging>=21; python_version>='3.10'",
   "tomli>=1.1; python_version<'3.11'",
-  "virtualenv>=20.14.1; python_version<'3.10'",
-  "virtualenv>=20.15; python_version>='3.10'",
+  "virtualenv>=20.15",
 ]
 optional-dependencies.pbs = [
   "pbs-installer[all]>=2025.1.6",
@@ -172,7 +170,7 @@ report.exclude_also = [
 report.omit = [ "nox/_typing.py" ]
 
 [tool.mypy]
-python_version = "3.9"
+python_version = "3.10"
 strict = true
 warn_unreachable = true
 enable_error_code = [ "ignore-without-code", "redundant-expr", "truthy-bool" ]

tests/conftest.py

@@ -18,10 +18,13 @@
 import subprocess
 from pathlib import Path
 from string import Template
-from typing import Any, Callable
+from typing import TYPE_CHECKING, Any
 
 import pytest
 
+if TYPE_CHECKING:
+    from collections.abc import Callable
+
 HAS_CONDA = shutil.which("conda") is not None
 
 

tests/resources/noxfile_requires.py

@@ -67,7 +67,7 @@ def j(session):
     print(session.name)
 
 
-@nox.session(python=["3.9", "3.10"])
+@nox.session(python=["3.10", "3.11"])
 def k(session):
     print(session.name)
 
@@ -77,7 +77,7 @@ def m(session):
     print(session.name)
 
 
-@nox.session(python="3.10", requires=["k-{python}"])
+@nox.session(python="3.11", requires=["k-{python}"])
 def n(session):
     print(session.name)
 
@@ -87,7 +87,7 @@ def o(session):
     print(session.name)
 
 
-@nox.session(python=["3.9", "3.10"])
+@nox.session(python=["3.10", "3.11"])
 def p(session):
     print(session.name)