Bump Python version to 3.13

[ndonyapour]

Tracking issue

Closes flyteorg/flyte#6993

Why are the changes needed?

Python 3.13 was released in October 2024, and flytekit should support it. The previous requires-python constraint was >=3.10,<3.13, which explicitly excluded Python 3.13. Several issues needed to be addressed:

1. The requires-python constraint needed to be updated from >=3.10,<3.13 to >=3.10,<3.14 to allow Python 3.13
2. Python 3.13 was missing from the project classifiers in pyproject.toml
3. The PythonVersion enum didn't include Python 3.13, causing ValueError: (3, 13) is not a valid PythonVersion errors when running tests
4. CI workflows didn't test Python 3.13
5. Plugin default images didn't support Python 3.13
6. Tests for tensorflow/pytorch were failing on Python 3.13 because these libraries don't support Python 3.12+ yet

What changes were proposed in this pull request?

Core Changes

• pyproject.toml:

  • Updated requires-python from ">=3.10,<3.13" to ">=3.10,<3.14" to allow Python 3.13
  • Added "Programming Language :: Python :: 3.13" to project classifiers

• flytekit/configuration/default_images.py:

  • Added PYTHON_3_13 = (3, 13) to PythonVersion enum
  • Added Python 3.13 default image prefix: "cr.flyte.org/flyteorg/flytekit:py3.13-"

Plugin Updates

• plugins/flytekit-sqlalchemy/flytekitplugins/sqlalchemy/task.py: Added Python 3.13 to SQLAlchemyDefaultImages._DEFAULT_IMAGE_PREFIXES
• plugins/flytekit-openai/flytekitplugins/openai/batch/task.py: Added Python 3.13 to OpenAIBatchDefaultImages._DEFAULT_IMAGE_PREFIXES

Test Updates

Added pytest.importorskip() and pytestmark = pytest.mark.skipif(sys.version_info >= (3, 12), ...) to skip tensorflow/pytorch tests on Python 3.12+:

• tests/flytekit/unit/extras/pytorch/test_checkpoint.py
• tests/flytekit/unit/extras/pytorch/test_native.py
• tests/flytekit/unit/extras/pytorch/test_transformations.py
• tests/flytekit/unit/extras/tensorflow/record/test_transformations.py
• tests/flytekit/unit/extras/tensorflow/record/test_record.py
• tests/flytekit/unit/extras/tensorflow/model/test_model.py
• tests/flytekit/unit/extras/tensorflow/model/test_transformations.py

These tests are automatically skipped on Python 3.12+ because tensorflow and pytorch don't support these Python versions yet.

CI/CD Updates

• .github/workflows/pythonbuild.yml:

  • Added Python 3.13 to scheduled test runs: ["3.10","3.11","3.12","3.13"]
  • Updated extras test skip condition: if: ${{ matrix.python-version != '3.12' && matrix.python-version != '3.13' }}
  • Added Python 3.13 exclusions for incompatible plugins (airflow, mlflow, modin, vaex, ray, kf-pytorch, onnx-pytorch)
  • Added Python 3.13 exclusion for pandas<2.0.0 test matrix

• .github/workflows/pythonpublish.yml:

  • Added Python 3.13 to Docker image build matrix: ["3.10","3.11","3.12","3.13"]

• .github/workflows/build_image.yml:

  • Already includes Python 3.13 (no changes needed)

Documentation

• dev-requirements.in: Updated comments to reflect that tensorflow/torch don't support Python 3.12+ yet

How was this patch tested?

Setup process

1. Created a Python 3.13 uv environment:

   uv venv --python 3.13
   source .venv/bin/activate  # or `.venv\Scripts\activate` on Windows

2. Installed dependencies and dev requirements:

uv pip install -r dev-requirements.in

3. Verified Python 3.13 enum works correctly:
```bash
python -c "from flytekit.configuration.default_images import PythonVersion; print(PythonVersion((3, 13)))"
# Output: PythonVersion.PYTHON_3_13

4. Ran unit tests using make commands:

   make unit_test

5. Verified tensorflow/pytorch tests are properly skipped:

   make unit_test_extras

Test Results

• ✅ Python 3.13 enum correctly recognizes (3, 13)
• ✅ Core unit tests pass on Python 3.13
• ✅ Tensorflow/pytorch tests are automatically skipped on Python 3.13
• ✅ CI workflows updated to test Python 3.13 in scheduled runs
• ✅ Docker images will be built for Python 3.13 on releases

Screenshots

N/A (code changes only)

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

N/A

Docs link

N/A (no documentation changes required)

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Note: Some plugins are excluded from Python 3.13 CI runs due to dependency incompatibilities (documented in workflow exclusions). These will be re-enabled as dependencies add Python 3.13 support.