pbrod
Add support for Python 3.13 and remove support for Python 3.9
Add support for Python 3.13 and remove support for Python 3.9
This is a follow-up to Pull Request #23. Tests against Python 3.13 are mostly passing now (see below). The impact is that Python 3.9 support is removed. This is expected as Python 3.9 end-of-life is approaching this year.
Following the "Pull Request Guidelines"
Include an example for use
No core aspects were changed. One test was updated to reflect a recommendation from ruff.
Update the author list in AUTHORS.rst if applicable
Not applicable
Ensure that all checks passed (current checks include GitHub Actions)
Not all checks passed on my end again due to the frequently experienced TclError with Windows. While I have recommended add try-except with any doctest that calls matplotlib or to remove matplotlib in doctests altogether, I understand its impact on readability.
EDIT: Add some wording to reflect not all tests actually passed, but this is known and minor recurring problem.
