Update Twisted and Python support matrix

Twisted 23.10.0 dropped support for Python 3.7 and added support for
Python 3.12.

Twisted 23.8.0 added support for Python 3.11 and drops support for
PyPy <3.9.

Twisted 22.10.0 is our new lower bound for twisted/twisted#11635.

Python 3.11 and 3.12 now exist.

.github/workflows/ci.yaml

@@ -51,7 +51,7 @@ jobs:
           ${{ runner.os }}-pip-docs-
           ${{ runner.os }}-pip-
 
-    - run: python -m pip install tox
+    - run: python -m pip install 'tox<4'
 
     - run: tox -q -e docs
 
@@ -63,15 +63,35 @@ jobs:
     continue-on-error: ${{ matrix.experimental }}
     strategy:
       matrix:
-          python-version: ["3.7", "3.8", "3.9", "3.10", "pypy-3.8", "pypy-3.9"]
+          # Python versions common to lowest and latest
+          python-version: ["3.8", "3.9", "3.10", "pypy-3.9"]
           twisted-version: ["lowest", "latest"]
           experimental: [false]
 
           include:
-          - python-version: "3.8"
-            twisted-version: "trunk"
-            experimental: true
+          # Pythons too old for latest
+          - python-version: "3.7"
+            twisted-version: "lowest"
+            experimental: false
+
+          - python-version: "pypy-3.8"
+            twisted-version: "lowest"
+            experimental: false
+
+          # Pythons too new for lowest
+          - python-version: "3.11"
+            twisted-version: "latest"
+            experimental: false
+
+          - python-version: "3.12"
+            twisted-version: "latest"
+            experimental: false
+
+          - python-version: "pypy-3.10"
+            twisted-version: "latest"
+            experimental: false
 
+          # Experimental trunk build
           - python-version: "3.9"
             twisted-version: "trunk"
             experimental: true
@@ -101,8 +121,11 @@ jobs:
           "3.8": "py38",
           "3.9": "py39",
           "3.10": "py310",
+          "3.11": "py311",
+          "3.12": "py312",
           "pypy-3.8": "pypy3",
           "pypy-3.9": "pypy3",
+          "pypy-3.10": "pypy3",
         }
         factor = table["${{ matrix.python-version }}"]
         print("::set-output name=value::" + factor)

changelog.d/364.feature.rst

@@ -0,0 +1 @@
+Python 3.11 is now supported.

changelog.d/374.feature.rst

@@ -0,0 +1 @@
+PyPy 3.10 is now supported.

changelog.d/374.removal.rst

@@ -0,0 +1,3 @@
+Support for PyPy 3.8, which has reached end of support, is deprecated. This is the last release with support for PyPy 3.8.
+
+The minimum supported Twisted version has increased to 22.10.0. Older versions are no longer tested in CI.

setup.py

@@ -7,11 +7,11 @@
     "Operating System :: OS Independent",
     "Framework :: Twisted",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.6",
-    "Programming Language :: Python :: 3.7",
     "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 :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",
 ]
@@ -32,7 +32,7 @@
             "incremental",
             "requests >= 2.1.0",
             "hyperlink >= 21.0.0",
-            "Twisted[tls] >= 18.7.0",
+            "Twisted[tls] >= 22.10.0",
             "attrs",
         ],
         extras_require={

tox.ini

@@ -1,8 +1,8 @@
 [tox]
 envlist =
     py37-twisted_lowest,
-    {pypy3,py37,py38,py39,py310}-twisted_latest,
-    {pypy3,py37,py38,py39,py310}-twisted_trunk,
+    {pypy3,py38,py39,py310,py311,py312}-twisted_latest,
+    {pypy3,py38,py39,py310,py311,py312}-twisted_trunk,
     twine, check-manifest, flake8, docs, coverage-report
 isolated_build = true
 
@@ -11,7 +11,7 @@ extras = dev
 deps =
     coverage
 
-    twisted_lowest: Twisted==18.7.0
+    twisted_lowest: Twisted==22.10.0
     twisted_latest: Twisted
     twisted_trunk: https://github.com/twisted/twisted/archive/trunk.zip
 setenv =
@@ -60,7 +60,7 @@ commands =
     sphinx-build -b html . html
 
 [testenv:coverage-report]
-depends = pypy3,py37,py38,py39
+depends = pypy3,py37,py38,py39,py310,py311,py312
 commands =
     coverage combine
     coverage report