Add CI tests for Python 3.12

.github/workflows/ci_cron_daily.yml

@@ -44,6 +44,14 @@ jobs:
             tox_env: 'py311-test-devdeps'
             toxposargs: --remote-data=any
             allow_failure: true
+            prefix: '(Allowed failure)'
+
+          - os: ubuntu-latest
+            python: '3.12-dev'
+            tox_env: 'py312-test-devdeps312'
+            toxposargs: --remote-data=any
+            allow_failure: true
+            prefix: '(Allowed failure)'
 
     steps:
     - name: Check out repository

.github/workflows/ci_tests.yml

@@ -98,6 +98,13 @@ jobs:
             allow_failure: true
             prefix: '(Allowed failure)'
 
+          - os: ubuntu-latest
+            python: '3.12-dev'
+            tox_env: 'py312-test-devdeps312'
+            toxposargs: --remote-data=any
+            allow_failure: true
+            prefix: '(Allowed failure)'
+
     steps:
     - name: Check out repository
       uses: actions/checkout@v4
@@ -109,8 +116,7 @@ jobs:
         python-version: ${{ matrix.python }}
     - name: Install base dependencies
       run: |
-        python -m pip install --upgrade pip
-        python -m pip install tox
+        python -m pip install --upgrade pip setuptools tox
     - name: Print Python, pip, setuptools, and tox versions
       run: |
         python -c "import sys; print(f'Python {sys.version}')"

pyproject.toml

@@ -125,6 +125,8 @@ filterwarnings = [
     'ignore:numpy.ndarray size changed:RuntimeWarning',
     # numpy 1.24 deprecation from skimage (can remove for skimage >= 0.20)
     'ignore:`np.bool8` is a deprecated alias for `np.bool_`:DeprecationWarning',
+    # python 3.12 deprecation in matplotlib 3.9dev
+    'ignore:datetime.datetime.utcfromtimestamp\(\) is deprecated:DeprecationWarning',
 ]
 
 [tool.coverage.run]

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 envlist =
-    py{39,310,311}-test{,-alldeps,-devdeps,-oldestdeps,-devinfra}{,-cov}
-    py{39,310,311}-test-numpy{122,123,124,125,126}
+    py{39,310,311,312}-test{,-alldeps,-devdeps,-devdeps312,-oldestdeps,-devinfra}{,-cov}
+    py{39,310,311,312}-test-numpy{122,123,124,125,126}
     build_docs
     linkcheck
     codestyle
@@ -17,6 +17,7 @@ isolated_build = true
 setenv =
     MPLBACKEND=agg
     devdeps: PIP_EXTRA_INDEX_URL = https://pypi.anaconda.org/scientific-python-nightly-wheels/simple https://pypi.anaconda.org/astropy/simple
+    devdeps312: PIP_EXTRA_INDEX_URL = https://pypi.anaconda.org/scientific-python-nightly-wheels/simple https://pypi.anaconda.org/astropy/simple
 
 # Pass through the following environment variables which may be needed
 # for the CI
@@ -72,7 +73,16 @@ deps =
     devdeps: scikit-learn>=0.0.dev0
     devdeps: matplotlib>=0.0.dev0
     devdeps: astropy>=0.0.dev0
-    devdeps: git+https://github.com/spacetelescope/gwcs.git
+    # TEMPORARY: gwcs used deprecated pkg_resources
+    # https://github.com/spacetelescope/gwcs/pull/478
+    # devdeps: git+https://github.com/spacetelescope/gwcs.git
+
+    # scikit-image and scikit-learn Python 3.12 wheels are not available
+    devdeps312: numpy>=0.0.dev0
+    devdeps312: scipy>=0.0.dev0
+    devdeps312: matplotlib>=0.0.dev0
+    devdeps312: astropy>=0.0.dev0
+    devdeps312: git+https://github.com/spacetelescope/gwcs.git
 
     # Latest developer version of infrastructure packages.
     devinfra: git+https://github.com/pytest-dev/pytest.git
@@ -95,6 +105,7 @@ commands =
     # Force numpy-dev after matplotlib downgrades it
     # (https://github.com/matplotlib/matplotlib/issues/26847)
     devdeps: python -m pip install --pre --upgrade --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple numpy
+    devdeps312: python -m pip install --pre --upgrade --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple numpy
     pip freeze
     pytest --pyargs photutils {toxinidir}/docs \
     cov: --cov photutils --cov-config={toxinidir}/pyproject.toml --cov-report xml:{toxinidir}/coverage.xml --cov-report term-missing \