Drop Python 3.9 (#351)

# Changes

## Drop Python 3.9

EOL of 2025-10-31.

See also:
- https://devguide.python.org/versions/#:~:text=Release%20manager-,3.9,-PEP%20596
- https://peps.python.org/pep-0596/

Author: tony

.github/workflows/tests.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.14']
+        python-version: ['3.10', '3.14']
     steps:
       - uses: actions/checkout@v4
 

CHANGES

@@ -15,6 +15,14 @@ $ pip install --user --upgrade --pre unihan-db
 
 <!-- Maintainers, insert changes / features for the next release here -->
 
+### Breaking changes
+
+- Drop support for Python 3.9; the new minimum is Python 3.10 (#351).
+
+  See also:
+  - [Python 3.9 EOL timeline](https://devguide.python.org/versions/#:~:text=Release%20manager-,3.9,-PEP%20596)
+  - [PEP 596](https://peps.python.org/pep-0596/)
+
 ### Development
 
 - Add Python 3.14 to test matrix (#350)

pyproject.toml

@@ -2,7 +2,7 @@
 name = "unihan_db"
 version = "0.18.0"
 description = "SQLAlchemy models for UNIHAN CJK database"
-requires-python = ">=3.9,<4.0"
+requires-python = ">=3.10,<4.0"
 license = { text = "MIT" }
 authors = [
   {name = "Tony Narlock", email = "[email protected]"}
@@ -14,7 +14,6 @@ classifiers = [
   "Intended Audience :: Developers",
   "Programming Language :: Python",
   "Programming Language :: Python :: 3",
-  "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.13",
@@ -124,14 +123,14 @@ build-backend = "hatchling.build"
 
 [tool.mypy]
 strict = true
-python_version = "3.9"
+python_version = "3.10"
 files = [
   "src/",
   "tests/",
 ]
 
 [tool.ruff]
-target-version = "py39"
+target-version = "py310"
 
 [tool.ruff.lint]
 select = [

tests/test_example.py

@@ -2,7 +2,6 @@
 
 from __future__ import annotations
 
-import importlib
 import importlib.util
 import sys
 import typing as t