DO NOT MERGE: Test Python 3.14

[cclauss]

Describe your change:

• [x] Test Python 3.14
• [ ] Add an algorithm?
• [ ] Fix a bug or typo in an existing algorithm?
• [ ] Add or change doctests? -- Note: Please avoid changing both code and tests in a single pull request.
• [ ] Documentation change?

Checklist:

• [ ] I have read CONTRIBUTING.md.
• [ ] This pull request is all my own work -- I have not plagiarized.
• [ ] I know that pull requests will not be merged if they fail the automated tests.
• [ ] This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• [ ] All new Python files are placed inside an existing directory.
• [ ] All filenames are in all lowercase characters with no spaces or dashes.
• [ ] All functions and variable names follow Python naming conventions.
• [ ] All function parameters and return values are annotated with Python type hints.
• [ ] All functions have doctests that pass the automated testing.
• [ ] All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
• [ ] If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes #ISSUE-NUMBER".

[cclauss]

@hugovk congratulations on the compatibility of Python 3.14 beta. This repo contains tested Python algorithms spanning lots of domains and third-party libraries from a huge variety of contributors. We always test and run on the current version of CPython and when each beta 1 release ships I port to it making any required changes.

Of all the upgrades that I have done, Python v3.14 is by far the cleanest and simplest!! Third party tools like SciPy, Pillow, and H5py all seem ready to go. This has never been the case before so I suspect that you have been doing a lot of behind-the-scenes work to ensure everyone is ready for a great release.

We needed to rename our compression directory (#12725) and change the text of a few exceptions, but these were trivial changes. radix2_fft.py requires doctest changes that I cannot understand, but for an initial beta, I am very impressed.

Thanks and congratulations 🎉🎈🍾

• #12725

[hugovk]

Good to hear, thank you! And thank you for the early testing :)

Of all the upgrades that I have done, Python v3.14 is by far the cleanest and simplest!! Third party tools like SciPy, Pillow, and H5py all seem ready to go. This has never been the case before so I suspect that you have been doing a lot of behind-the-scenes work to ensure everyone is ready for a great release.

Personally I've only been involved with Pillow, but I suspect much of it is down to the excellent work done by the Quansight team helping projects get ready for free-threading, which overlaps getting ready for 3.14. cc @ngoldbaum @lysnikolaou

https://labs.quansight.org/blog/free-threaded-python-rollout

[cclauss]

Python 3.14 (the π version) was released today.

• https://www.python.org/downloads/release/python-3140/
• https://github.com/actions/python-versions/releases