Add support for Python 3.13

This commit adds support for Python 3.13 by:
- Updating `setup.py` to include Python 3.13 in the classifiers.
- Updating `noxfile.py` to include Python 3.13 in the test matrix.
- Adding a constraints file for Python 3.13.
- Updating the unit test workflow in `.github/workflows/unittest.yml` to include Python 3.13.
- Updating documentation files (`CONTRIBUTING.rst` and `docs/README.rst`) to include Python 3.13.

Author: google-labs-jules[bot]

.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
@@ -34,12 +34,40 @@ jobs:
         name: coverage-artifact-${{ matrix.python }}
         path: .coverage-${{ matrix.python }}
         include-hidden-files: true
+  unit-prerelease:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python: ['3.13']
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Setup Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python }}
+    - name: Install nox
+      run: |
+        python -m pip install --upgrade setuptools pip wheel
+        python -m pip install nox
+    - name: Run unit tests
+      env:
+        COVERAGE_FILE: .coverage-prerelease-${{ matrix.python }}
+      run: |
+        nox -s unit_prerelease-${{ matrix.python }}
+    - name: Upload coverage results
+      uses: actions/upload-artifact@v4
+      with:
+        name: coverage-artifact-prerelease-${{ matrix.python }}
+        path: .coverage-prerelease-${{ matrix.python }}
+        include-hidden-files: true
+
 
   unit-prerelease:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python: ['3.12']
+        python: ['3.13']
     steps:
     - name: Checkout
       uses: actions/checkout@v4
@@ -55,7 +83,7 @@ jobs:
       env:
         COVERAGE_FILE: .coverage-prerelease-${{ matrix.python }}
       run: |
-        nox -s unit_prerelease
+        nox -s unit_prerelease-${{ matrix.python }}
     - name: Upload coverage results
       uses: actions/upload-artifact@v4
       with:

noxfile.py

@@ -34,7 +34,7 @@
 
 DEFAULT_PYTHON_VERSION = "3.8"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -270,13 +270,13 @@ def prerelease(session, tests_path):
     )
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS[-1])
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
 def compliance(session):
     """Run the compliance test suite."""
     default(session, os.path.join("tests", "compliance"))
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS[-1])
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
 def compliance_prerelease(session):
     """Run the compliance test suite with prerelease dependencies."""
     prerelease(session, os.path.join("tests", "compliance"))
@@ -288,7 +288,7 @@ def unit(session):
     default(session, os.path.join("tests", "unit"))
 
 
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS[-1])
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
 def unit_prerelease(session):
     """Run the unit test suite with prerelease dependencies."""
     prerelease(session, os.path.join("tests", "unit"))

setup.py

@@ -69,6 +69,7 @@ def readme():
         "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 :: Database :: Front-Ends",
     ],