chore: stop support py3.9, now support py3.10-3.15

.github/workflows/test.yml

@@ -18,11 +18,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # Execute tests on python 3.9-3.14 on ubuntu
+        # Execute tests on python 3.10-3.15 on ubuntu
         # and python 3.14 on macOS and windows
         include:
-          - os: ubuntu-24.04
-            python-version: "3.9"
           - os: ubuntu-24.04
             python-version: "3.10"
           - os: ubuntu-24.04
@@ -33,6 +31,8 @@ jobs:
             python-version: "3.13"
           - os: ubuntu-24.04
             python-version: "3.14"
+          - os: ubuntu-24.04
+            python-version: "3.15.0-beta.2"
           - os: macos-26
             python-version: "3.14"
           - os: windows-2025

Makefile

@@ -23,11 +23,7 @@ ruff-check:
 	uv run --group quality --locked ruff format --check
 
 mypy-check:
-	@if uv run --locked python -c 'import sys; raise SystemExit(0 if sys.version_info >= (3, 10) else 1)'; then \
-		uv run --group tests --group types --group quality --locked mypy; \
-	else \
-		echo "Skipping mypy: Python 3.10 or newer is required."; \
-	fi
+	uv run --group tests --group types --group quality --locked mypy
 
 check:
 	make ruff-check

README.md

@@ -26,7 +26,7 @@ Default local download target: LanguageTool `6.8`.
 
 ## Requirements
 
-- Python `>=3.9` (tested up to 3.14)
+- Python `>=3.10` (tested up to 3.15)
 - Java (to run local LanguageTool server):
   - LanguageTool `< 6.6`: Java `>=9`
   - LanguageTool `>= 6.6` (default): Java `>=17`

language_tool_python/_compat.py

@@ -6,17 +6,10 @@
   ``typing_extensions.deprecated``.
 - ``toml_loads``: built-in ``tomllib.loads`` on Python 3.11+, otherwise
   ``tomli.loads``.
-- ``TypeGuard``: built-in ``typing.TypeGuard`` on Python 3.10+, otherwise
-  ``typing_extensions.TypeGuard``.
 """
 
 import sys
 
-if sys.version_info >= (3, 10):
-    from typing import TypeGuard
-else:
-    from typing_extensions import TypeGuard
-
 if sys.version_info >= (3, 11):
     from tomllib import loads as toml_loads
 else:
@@ -27,4 +20,4 @@
 else:
     from typing_extensions import deprecated
 
-__all__ = ["TypeGuard", "deprecated", "toml_loads"]
+__all__ = ["deprecated", "toml_loads"]

language_tool_python/api_types.py

@@ -5,7 +5,7 @@
 from typing import TYPE_CHECKING, TypedDict
 
 if TYPE_CHECKING:
-    from ._compat import TypeGuard
+    from typing import TypeGuard
 
 __all__ = [
     "Category",

language_tool_python/config_file.py

@@ -9,13 +9,12 @@
 from dataclasses import dataclass
 from os import PathLike
 from pathlib import Path
-from typing import TypeVar, Union, cast
+from typing import TypeVar, cast
 
 from .exceptions import PathError
 from .utils import SupportsBool
 
-# Union here because | not supported by PathLike in py3.9
-ConfigValue = Union[PathLike[str], SupportsBool, str, int, float, Iterable[str]]
+ConfigValue = PathLike[str] | SupportsBool | str | int | float | Iterable[str]
 ConfigValueT = TypeVar("ConfigValueT", bound=ConfigValue)
 
 logger = logging.getLogger(__name__)

language_tool_python/match.py

@@ -7,7 +7,7 @@
 from collections import OrderedDict
 from collections import OrderedDict as OrderedDictType
 from functools import total_ordering
-from typing import TYPE_CHECKING, Union
+from typing import TYPE_CHECKING
 
 from ._compat import deprecated
 from .utils import SupportsFloat, SupportsInt
@@ -22,7 +22,7 @@
 UTF8_4_BYTE_LENGTH = 4
 CONTEXT_PREFIX_SUFFIX_LENGTH = 3
 CONTEXT_WITH_ADDITIONS_MIN_LENGTH = 6
-MatchValue = Union[str, int, list[str]]  # | operator not fully supported by py3.9
+MatchValue = str | int | list[str]
 
 
 def get_match_ordered_dict() -> OrderedDictType[str, type]:

make.bat

@@ -40,12 +40,6 @@ uv run --group quality --locked ruff format --check
 exit /b %errorlevel%
 
 :mypy-check
-uv run --locked python -c "import operator, sys; raise SystemExit(0 if operator.ge(sys.version_info[:2], (3, 10)) else 1)"
-if errorlevel 1 (
-    echo Skipping mypy: Python 3.10 or newer is required.
-    exit /b 0
-)
-
 uv run --group tests --group types --group quality --locked mypy
 exit /b %errorlevel%
 

pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "language_tool_python"
 version = "3.4.0" # Keep in sync with docs/source/conf.py
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 description = "Checks grammar using LanguageTool."
 readme = { file = "README.md", content-type = "text/markdown" }
 license = "GPL-3.0-only"
@@ -14,12 +14,12 @@ maintainers = [
 ]
 classifiers = [
     "Programming Language :: Python :: 3",
-    "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 :: 3.14",
+    "Programming Language :: Python :: 3.15",
     "Operating System :: OS Independent",
     "Topic :: Software Development :: Libraries :: Python Modules",
     "Topic :: Text Processing :: Linguistic",
@@ -32,9 +32,7 @@ dependencies = [
     "packaging",
     "psutil",
     "tomli; python_version < '3.11'", # only needed for py < 3.11 because tomllib added in 3.11 is used in the codebase, needs a fallback
-    # needed for py < 3.13 because warnings.deprecated added in 3.13 is used in the codebase
-    # also needed for py < 3.10 because of the usage of typing.TypeGuard in the codebase, which is backported to typing_extensions for py < 3.10
-    "typing_extensions; python_version < '3.13'",
+    "typing_extensions; python_version < '3.13'", # only needed for py < 3.13 because warnings.deprecated added in 3.13 is used in the codebase
 ]
 
 [project.urls]
@@ -62,7 +60,7 @@ types = [
 
 quality = [
     # Keep in sync mypy version with .pre-commit-config.yaml
-    "mypy==2.1.0; python_version >= '3.10'", # mypy checks must be run with Python >= 3.10
+    "mypy==2.1.0",
     # Keep in sync ruff version with .pre-commit-config.yaml
     "ruff==0.15.16",
 ]