Add Python 3.13, drop Python 3.8

.github/workflows/main.yml

@@ -15,7 +15,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
 
     name: Python ${{ matrix.python-version}}
     steps:

justfile

@@ -13,11 +13,11 @@ test: devenv
 
 # Format files
 format: devenv
-    uv run tox exec -e py38-lint -- ruff format
+    uv run tox exec -e py39-lint -- ruff format
 
 # Lint files
 lint: devenv
-    uv run tox -e py38-lint
+    uv run tox -e py39-lint
 
 # Wipe devenv and build artifacts
 clean:

pyproject.toml

@@ -6,19 +6,19 @@ readme = "README.rst"
 keywords = ["conf", "config", "configuration", "ini", "env", "yaml"]
 authors = [{name = "Will Kahn-Greene"}]
 license = {text = "MPLv2"}
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dependencies = []
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Developers",
     "License :: OSI Approved :: Mozilla Public License 2.0 (MPL 2.0)",
     "Natural Language :: English",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: Implementation :: CPython",
     "Topic :: Software Development :: Libraries :: Python Modules",
 ]
@@ -47,8 +47,7 @@ dev = [
     "tox-uv",
     "twine",
     "types-PyYAML",
-    "Sphinx==7.2.6; python_version > '3.8'",
-    "Sphinx==6.2.1; python_version <= '3.8'",
+    "Sphinx==7.2.6",
     "sphinx_rtd_theme",
 ]
 
@@ -59,7 +58,7 @@ build-backend = "setuptools.build_meta"
 
 
 [tool.ruff]
-target-version = "py38"
+target-version = "py39"
 src = ["src"]
 line-length = 88
 
@@ -76,7 +75,7 @@ docstring-quotes = "double"
 
 
 [tool.mypy]
-python_version = "3.8"
+python_version = "3.9"
 disallow_untyped_defs = true
 
 [[tool.mypy.overrides]]
@@ -103,41 +102,41 @@ filterwarnings = [
 legacy_tox_ini = """
 [tox]
 envlist =
-    py38
-    py38-doctest
-    py38-lint
-    py38-typecheck
     py39
+    py39-doctest
+    py39-lint
+    py39-typecheck
     py310
     py311
     py312
+    py313
 uv_python_preference = only-managed
 
 [gh-actions]
 python =
-    3.8: py38
     3.9: py39
     3.10: py310
     3.11: py311
     3.12: py312
+    3.13: py313
 
 [testenv]
 extras = dev,ini,sphinx,yaml
 commands = pytest {posargs} tests/
 
-[testenv:py38-doctest]
+[testenv:py39-doctest]
 commands = pytest --doctest-modules src/
 
-[testenv:py38-lint]
+[testenv:py39-lint]
 allowlist_externals = ruff
-basepython = python3.8
+basepython = python3.9
 changedir = {toxinidir}
 commands =
     ruff format --check tests docs examples
     ruff check src tests docs examples
 
-[testenv:py38-typecheck]
-basepython = python3.8
+[testenv:py39-typecheck]
+basepython = python3.9
 changedir = {toxinidir}
 commands =
     mypy src/everett/

src/everett/__init__.py

@@ -9,7 +9,7 @@
     version as importlib_version,
     PackageNotFoundError,
 )
-from typing import Callable, List, Union
+from typing import Callable, Union
 
 
 try:
@@ -60,7 +60,7 @@ class DetailedConfigurationError(ConfigurationError):
     """Base class for configuration errors that have a msg, namespace, key, and parser."""
 
     def __init__(
-        self, msg: str, namespace: Union[List[str], None], key: str, parser: Callable
+        self, msg: str, namespace: Union[list[str], None], key: str, parser: Callable
     ):
         self.msg = msg
         self.namespace = namespace

src/everett/ext/inifile.py

@@ -12,7 +12,7 @@
 
 import logging
 import os
-from typing import Dict, List, Optional, Union
+from typing import Optional, Union
 
 from configobj import ConfigObj
 
@@ -124,7 +124,7 @@ class ConfigIniEnv:
 
     """
 
-    def __init__(self, possible_paths: Union[str, List[str]]) -> None:
+    def __init__(self, possible_paths: Union[str, list[str]]) -> None:
         """
         :param possible_paths: either a single string with a file path (e.g.
             ``"/etc/project.ini"`` or a list of strings with file paths
@@ -147,11 +147,11 @@ def __init__(self, possible_paths: Union[str, List[str]]) -> None:
         if not self.path:
             logger.debug("No INI file found: %s", possible_paths)
 
-    def parse_ini_file(self, path: str) -> Dict:
+    def parse_ini_file(self, path: str) -> dict:
         """Parse ini file at ``path`` and return dict."""
         cfgobj = ConfigObj(path, list_values=False)
 
-        def extract_section(namespace: List[str], d: Dict) -> Dict:
+        def extract_section(namespace: list[str], d: dict) -> dict:
             cfg = {}
             for key, val in d.items():
                 if isinstance(d[key], dict):
@@ -164,7 +164,7 @@ def extract_section(namespace: List[str], d: Dict) -> Dict:
         return extract_section([], cfgobj.dict())
 
     def get(
-        self, key: str, namespace: Optional[List[str]] = None
+        self, key: str, namespace: Optional[list[str]] = None
     ) -> Union[str, NoValue]:
         """Retrieve value for key."""
         if not self.path:

src/everett/ext/yamlfile.py

@@ -12,7 +12,7 @@
 
 import logging
 import os
-from typing import Dict, List, Optional, Union
+from typing import Optional, Union
 
 import yaml
 
@@ -109,7 +109,7 @@ class ConfigYamlEnv:
 
     """
 
-    def __init__(self, possible_paths: Union[str, List[str]]) -> None:
+    def __init__(self, possible_paths: Union[str, list[str]]) -> None:
         """
         :param possible_paths: either a single string with a file path (e.g.
             ``"/etc/project.yaml"`` or a list of strings with file paths
@@ -132,15 +132,15 @@ def __init__(self, possible_paths: Union[str, List[str]]) -> None:
         if not self.path:
             logger.debug("No YAML file found: %s", possible_paths)
 
-    def parse_yaml_file(self, path: str) -> Dict:
+    def parse_yaml_file(self, path: str) -> dict:
         """Parse yaml file at ``path`` and return a dict."""
-        with open(path, "r") as fp:
+        with open(path) as fp:
             data = yaml.safe_load(fp)
 
         if not data:
             return {}
 
-        def traverse(namespace: List[str], d: Dict) -> Dict:
+        def traverse(namespace: list[str], d: dict) -> dict:
             cfg = {}
             for key, val in d.items():
                 if isinstance(val, dict):
@@ -161,7 +161,7 @@ def traverse(namespace: List[str], d: Dict) -> Dict:
         return traverse([], data)
 
     def get(
-        self, key: str, namespace: Optional[List[str]] = None
+        self, key: str, namespace: Optional[list[str]] = None
     ) -> Union[str, NoValue]:
         """Retrieve value for key."""
         if not self.path: