MAINT: adding Python 3.13 to CI

Author: bsipocz

.github/workflows/ci_devtests.yml

@@ -36,6 +36,12 @@ jobs:
             toxenv: py312-test-alldeps-devdeps-cov
             toxargs: -v
 
+          - name: Python 3.13
+            os: ubuntu-latest
+            python: '3.13-dev'
+            toxenv: py313-test
+            toxargs: -v
+
     steps:
     - name: Checkout code
       uses: actions/checkout@v4

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{39,310,311,312}-test{,-alldeps,-oldestdeps,-devdeps,-predeps}{,-online}{,-cov}
+    py{39,310,311,312,313}-test{,-alldeps,-oldestdeps,-devdeps,-predeps}{,-online}{,-cov}
     codestyle
     linkcheck
     build_docs
@@ -24,6 +24,8 @@ setenv =
     PYTEST_ARGS = ''
     online: PYTEST_ARGS = --remote-data=any --reruns=1 --reruns-delay 10 -m "not bigdata"
     devdeps: PIP_EXTRA_INDEX_URL =  https://pypi.anaconda.org/scientific-python-nightly-wheels/simple https://pypi.anaconda.org/astropy/simple https://pypi.anaconda.org/liberfa/simple
+    # astropy doesn't yet have a 3.13 compatible release
+    py313: PIP_EXTRA_INDEX_URL = https://pypi.anaconda.org/astropy/simple https://pypi.anaconda.org/liberfa/simple
 
 deps =
     devdeps: numpy>=0.0.dev0
@@ -32,6 +34,9 @@ deps =
     devdeps: pyerfa>=0.0.dev0
     devdeps: git+https://github.com/astropy/pyvo.git#egg=pyvo
 
+    # astropy doesn't yet have a 3.13 compatible release
+    py313: astropy>0.0dev0
+
 # mpl while not a dependency, it's required for the tests, and would pull up a newer numpy version if not pinned.
 # And pillow should be pinned as well, otherwise a too new version is pulled that is not compatible with old np.