add testing on python 3.12

# Conflicts:
#	tox.ini

Author: tomato42

.github/workflows/ci.yml

@@ -83,6 +83,10 @@ jobs:
             os: ubuntu-latest
             python-version: '3.11'
             tox-env: py311
+          - name: py3.12
+            os: ubuntu-latest
+            python-version: '3.12.0-alpha.5'
+            tox-env: py312
           - name: pypy
             os: ubuntu-latest
             python-version: pypy-2.7

setup.py

@@ -41,6 +41,7 @@
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
     ],
     install_requires=["six>=1.9.0"],
     extras_require={"gmpy2": "gmpy2", "gmpy": "gmpy"},

tox.ini

@@ -1,17 +1,17 @@
 
 [tox]
-envlist = py26, py27, py35, py36, py37, py38, py39, py310, py311, py, pypy, pypy3, gmpy2py27, gmpy2py39, gmpy2py310, gmpypy27, gmpypy39, gmpypy310, codechecks
+envlist = py26, py27, py35, py36, py37, py38, py39, py310, py311, py312, py, pypy, pypy3, gmpy2py27, gmpy2py39, gmpy2py310, gmpypy27, gmpypy39, gmpypy310, codechecks
 
 [testenv]
 deps =
      py{26}: unittest2
      py{26}: hypothesis<3
-     py{26,27,35,36,37,38,39,310,311,py,py3}: pytest
-     py{27,35,36,37,38,39,310,311,py,py3}: hypothesis
-     gmpy2py{27,39,310,311}: gmpy2
-     gmpypy{27,39,310,311}: gmpy
-     gmpy{2py27,2py39,2py310,2py311,py27,py39,py310,py311}: pytest
-     gmpy{2py27,2py39,2py310,2py311,py27,py39,py310,py311}: hypothesis
+     py{26,27,35,36,37,38,39,310,311,312,py,py3}: pytest
+     py{27,35,36,37,38,39,310,311,312,py,py3}: hypothesis
+     gmpy2py{27,39,310,311,312}: gmpy2
+     gmpypy{27,39,310,311,312}: gmpy
+     gmpy{2py27,2py39,2py310,2py311,2py312,py27,py39,py310,py311,py312}: pytest
+     gmpy{2py27,2py39,2py310,2py311,2py312,py27,py39,py310,py311,py312}: hypothesis
 # six==1.9.0 comes from setup.py install_requires
      py27_old_six: six==1.9.0
      py27_old_six: pytest
@@ -50,6 +50,9 @@ basepython=python3.10
 [testenv:gmpypy311]
 basepython=python3.11
 
+[testenv:gmpypy312]
+basepython=python3.12
+
 [testenv:gmpy2py27]
 basepython=python2.7
 
@@ -62,6 +65,9 @@ basepython=python3.10
 [testenv:gmpy2py311]
 basepython=python3.11
 
+[testenv:gmpy2py312]
+basepython=python3.12
+
 [testenv:instrumental]
 basepython = python2.7
 deps =