[MAINTENANCE] Support for Python 3.13

[pyansys-ci-bot]

DISCLAIMER: This issue was created by a bot in behalf of the PyAnsys Core team. We have not verified whether your repository is already supporting Python 3.13. If that's the case, please close this issue and let us know by commenting in it.

Description

According to our internal guidance, we should start active support for Python 3.13 across all repositories in the PyAnsys ecosystem. Up until now, most of our projects have been blocked by some dependencies that were not compatible with Python 3.13. However, most of these dependencies have been updated to support Python 3.13, and we are now able to move forward with this change.

See ADR-21 for more information. Specifically, the section corresponding to Adding support

Action Items

1. Build the wheelhouse of the various repositories using Python 3.13.
2. Build the documentation using Python 3.13 (whenever possible).
3. Run the test suites using Python 3.13 (whenever possible).

Steps 2 and 3 may not be possible or undesired from your side, in case you want to stick to a different version of Python for the documentation and testing. Most repositories have a MAIN_PYTHON_VERSION environment variable that we are suggesting to bump to 3.13.

Reference Pull Request

For your reference, you can check the following PR that was created to bump the Python version to 3.13 in the pyansys-tools-versioning repository.

Example PR: PyAnsys Tools Versioning

Additional Information

Please ensure that all necessary updates and modifications are made to support Python 3.13 effectively. If there are any issues or concerns, feel free to discuss them in this issue.

Thank you for your cooperation.

Extra: blocking dependencies for Python 3.13 and their status

Most of the PyAnsys projects have a dependency on the vtk package, coming from its usage in the pyvista package. The vtk package has been updated to version 9.4.0 which now supports Python 3.13.

PyVista has decided to block its usage on version 0.44.2, while they work on supporting it for 0.43.0. This is due to the fact that there are some incompatibilities being addressed on their side. However, the impact on our libraries depends on whether we are making use of those advanced, impacted features. If we are not using them, we can start supporting Python 3.13 (while using a different PyVista version other than 0.44.2).

The list of incompatibilities are being tracked in the following issue https://github.com/pyvista/pyvista/issues/6731. Feel free to check it out.

We also recommend that the projects using self-hosted runners, both Windows and Linux based, upgrade the pyvista/setup-headless-display-action from version v2 to v3. This is due to the fact that VTK will require new Mesa3D library versions for running GPU-less rendering. This is not a blocker for the Python 3.13 support, but it is a good practice to keep the runners up-to-date.

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