Add Python 3.13 support

This commit introduces support for Python 3.13 as a runtime dependency.

The following changes were made:
- Updated `noxfile.py` to include Python 3.13 in unit and system test versions.
- Created `testing/constraints-3.13.txt` (initially empty, copied from an empty constraints-3.12.txt).
- Updated `.github/workflows/unittest.yml` to include Python 3.13 in the test matrix.
- Updated `setup.py` to add the Python 3.13 classifier.
- Updated `CONTRIBUTING.rst` to list Python 3.13 as a supported version.
- Created `.kokoro/presubmit/system-3.13.cfg` for Kokoro system tests.
- Updated `.github/sync-repo-settings.yaml` to include Python 3.13 in required status checks.
- Updated `owlbot.py` to include Python 3.13 in unit and system test versions for templated files.

Author: google-labs-jules[bot]

.github/sync-repo-settings.yaml

@@ -16,6 +16,7 @@ branchProtectionRules:
     - 'unit (3.10)'
     - 'unit (3.11)'
     - 'unit (3.12)'
+    - 'unit (3.13)'
     - 'cover'
     - 'Kokoro'
     - 'Samples - Lint'
@@ -24,6 +25,7 @@ branchProtectionRules:
     - 'Samples - Python 3.10'
     - 'Samples - Python 3.11'
     - 'Samples - Python 3.12'
+    - 'Samples - Python 3.13'
 permissionRules:
   - team: actools-python
     permission: admin

.github/workflows/unittest.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        python: ['3.8', '3.9', '3.10', '3.11', '3.12']
+        python: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
     steps:
     - name: Checkout
       uses: actions/checkout@v4

.kokoro/presubmit/system-3.13.cfg

@@ -0,0 +1,7 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Only run the following session(s)
+env_vars: {
+  key: "NOX_SESSION"
+  value: "system-3.13"
+}

CONTRIBUTING.rst

@@ -226,12 +226,14 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.8: https://docs.python.org/3.8/
 .. _Python 3.9: https://docs.python.org/3.9/
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.

noxfile.py

@@ -35,7 +35,7 @@
 DEFAULT_PYTHON_VERSION = "3.10"
 
 
-UNIT_TEST_PYTHON_VERSIONS = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -57,7 +57,7 @@
     "3.9": [],
 }
 
-SYSTEM_TEST_PYTHON_VERSIONS = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",

owlbot.py

@@ -35,8 +35,8 @@
 extras = ["tqdm", "geopandas"]
 templated_files = common.py_library(
     default_python_version="3.10",
-    unit_test_python_versions=["3.8", "3.9", "3.10", "3.11", "3.12"],
-    system_test_python_versions=["3.8", "3.9", "3.10", "3.11", "3.12"],
+    unit_test_python_versions=["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"],
+    system_test_python_versions=["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"],
     cov_level=96,
     unit_test_external_dependencies=["freezegun"],
     unit_test_extras=extras,

setup.py

@@ -90,6 +90,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
         "Topic :: Scientific/Engineering",