ENH: Add Python 3.12 and 3.13 to build-test-package CI workflow

[N-Dekker]

Python 3.12 and 3.13 now both have "bugfix" maintenance status, according to https://www.python.org/downloads/

[N-Dekker]

@thewtex Does the itk package already support Python 3.12 and 3.13? I don't see them at https://pypi.org/project/itk/#files

[thewtex]

@N-Dekker we should not be trying to build 3.12 and 3.13 Python packages.

[thewtex]

We do not want 12 and 13 here. Our 3.11 wheels work with 3.12 and 3.13.

[N-Dekker]

Thanks @thewtex, cool. But then, why do we have 10 and 11? Don't the 3.9 wheels work with 3.10 and 3.11?

[dzenanz]

Stable ABI was introduced with Python 3.11, see: https://docs.python.org/3.11/c-api/stable.html

[N-Dekker]

Interesting! Thanks @dzenanz Do the ITK wrappings just use the "Limited API" of Python? Is Py_LIMITED_API defined for ITK?

It looks like even Python 3.9 supports a Stable ABI, although it has less documentation: https://docs.python.org/3.9/c-api/stable.html So don't you think a single Python 3.9 wheel would be sufficient to support any Python version >= 3.9? We could potentially save a lot of energy (and save a little bit more of the planet)... 😇

[dzenanz]

I know that "official", "complete", "proper" (whatever) support for Python stable ABI has started with version 3.11. I don't know where that is written.

ITK has ITK_USE_PYTHON_LIMITED_API, which is on by default if Python version is 3.11+.

[N-Dekker]

I know that "official", "complete", "proper" (whatever) support for Python stable ABI has started with version 3.11. I don't know where that is written.

Ah, now I see, in What’s New In Python 3.11 section New Features:

• Py_buffer and APIs are now part of the limited API and the stable ABI:

  • PyObject_CheckBuffer()
  • PyObject_GetBuffer()
  • PyBuffer_GetPointer()
  • PyBuffer_SizeFromFormat()
  • PyBuffer_ToContiguous()
  • PyBuffer_FromContiguous()
  • PyObject_CopyData()
  • PyBuffer_IsContiguous()
  • PyBuffer_FillContiguousStrides()
  • PyBuffer_FillInfo()
  • PyBuffer_Release()
  • PyMemoryView_FromBuffer()
  • bf_getbuffer and bf_releasebuffer type slots

(Contributed by Christian Heimes in bpo-45459.)

[thewtex]

Yes, we need Python 3.11 for the CPython ABI we / our version of SWIG uses.