Deprecate Python 3.9 support (#138)

* Initial plan

* Deprecate Python 3.9 support

Co-authored-by: adrien-berchet <11536226+adrien-berchet@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: adrien-berchet <11536226+adrien-berchet@users.noreply.github.com>

Author: Copilot

.github/workflows/run-tox.yml

@@ -13,12 +13,12 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12"]
         min_versions: ["min_versions", "latest_versions"]
         exclude:
           - min_versions: "min_versions"
         include:
-          - python-version: "3.9"
+          - python-version: "3.10"
             min_versions: "min_versions"
 
     steps:

pyproject.toml

@@ -11,7 +11,6 @@ local_scheme = "no-local-version"
 [tool.black]
 line-length = 100
 target-version = [
-    "py39",
     "py310",
     "py311",
     "py312",

setup.py

@@ -52,7 +52,7 @@
     },
     license="Apache License 2.0",
     packages=find_namespace_packages(include=["luigi_tools*"]),
-    python_requires=">=3.9",
+    python_requires=">=3.10",
     use_scm_version=True,
     setup_requires=[
         "setuptools_scm",
@@ -71,7 +71,6 @@
         "License :: OSI Approved :: Apache Software License",
         "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",

tox.ini

@@ -8,7 +8,7 @@ envlist =
     lint
     docs
     min_versions
-    py{39,310,311,312}
+    py{310,311,312}
     coverage
 
 minversion = 3.18
@@ -45,7 +45,7 @@ commands =
     twine check {envtmpdir}/dist/*
 
 [testenv:min_versions]
-basepython = python3.9
+basepython = python3.10
 deps =
     Requirements-Builder
 commands_pre =
@@ -54,7 +54,7 @@ commands_pre =
     pip freeze
 
 [testenv:lint]
-basepython = python3.9
+basepython = python3.10
 deps =
     mock
     pre-commit
@@ -65,7 +65,7 @@ commands =
     pylint -j {env:PYLINT_NPROCS:1} {[base]files}
 
 [testenv:format]
-basepython = python3.9
+basepython = python3.10
 skip_install = true
 deps =
     codespell
@@ -84,7 +84,6 @@ commands = make html SPHINXOPTS=-W
 
 [gh-actions]
 python =
-  3.9: py39, lint
-  3.10: py310, check-packaging
+  3.10: py310, lint, check-packaging
   3.11: py311, docs
   3.12: py312