Drop Python 3.9 (#54)

# 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', '3.11', '3.12', '3.13', '3.14']
+        python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
         docutils-version: ['0.18', '0.19']
     steps:
       - uses: actions/checkout@v5

CHANGES

@@ -12,6 +12,14 @@ $ pip install --user --upgrade --pre gp-libs
 
 - _Add your latest changes from PRs here_
 
+### Breaking changes
+
+- Drop Python 3.9 (#54)
+
+  The minimum version of Python in this and future releases is Python 3.10.
+
+  Python 3.9 reached end-of-life status on October 5th, 2025 (see PEP 596).
+
 ### Development
 
 - Add Python 3.14 to test matrix (#53)

README.md

@@ -161,7 +161,7 @@ issue on the tracker.
 
 # More information
 
-- Python support: >= 3.9, pypy
+- Python support: >= 3.10, pypy
 - Source: <https://github.com/git-pull/gp-libs>
 - Docs: <https://gp-libs.git-pull.com>
 - Changelog: <https://gp-libs.git-pull.com/history.html>

pyproject.toml

@@ -2,7 +2,7 @@
 name = "gp-libs"
 version = "0.0.14"
 description = "Internal utilities for projects following git-pull python package spec"
-requires-python = ">=3.9,<4.0"
+requires-python = ">=3.10,<4.0"
 authors = [
   {name = "Tony Narlock", email = "[email protected]"}
 ]
@@ -17,7 +17,6 @@ classifiers = [
   "Operating System :: MacOS :: MacOS X",
   "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 :: 3.12",
@@ -130,14 +129,14 @@ packages = [
 
 [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 = [