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[WIP] Add support for Python 3.15 - check again in October 2026 - #1677

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issue-1635-python-3.15
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[WIP] Add support for Python 3.15 - check again in October 2026 #1677
niccokunzmann wants to merge 5 commits into
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issue-1635-python-3.15

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@niccokunzmann

@niccokunzmann niccokunzmann commented Aug 17, 2026

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` delimiters, inclusively, may be removed.

-->

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Description

This adds Python 3.15 to all the files listed in the issue.

Checklist

  • I added a change log entry, following the instructions in Change log entry format.
  • I followed icalendar's Artificial intelligence policy and disclosed my Responsible AI use in my commit messages, if applicable.
  • I added or updated tests, if applicable.
  • I ran and ensured all tests pass locally by following Run tests.
  • I added or edited documentation as necessary, both as docstrings to be rendered in the API documentation and narrative documentation, following the Style guide.

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read-the-docs-community Bot commented Aug 17, 2026 •
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niccokunzmann commented Aug 17, 2026 •
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Current issues:

Version 3.15 was not found in the local cache
Error: The version '3.15' with architecture 'x64' was not found for Ubuntu 24.04.
The list of all available versions can be found here: https://raw.githubusercontent.com/actions/python-versions/main/versions-manifest.json

Solution 3.15.0-rc.1 is the install version... commit a2bdb81

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This takes longer than expected. Current error: SystemError: module coverage.tracer uses unknown slot ID 85

niccokunzmann commented Aug 17, 2026 •
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Same for the documentation build:


 File "/home/runner/work/icalendar/icalendar/.venv/lib/python3.15/site-packages/charset_normalizer/api.py", line 8, in <module>
 from .cd import (
 ...<4 lines>...
 )
 SystemError: module charset_normalizer.cd uses unknown slot ID 84

I wonder what that problem is. It has to do with the Python C-API, I believe. https://peps.python.org/pep-0489/

Follow-up question:

Do these two modules support Python 3.15?
Is there only rc1 of Python 3.15 out?

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From the original issue:

Don't merge the pull request until after the final version of Python 3.15 is released around 2026年10月01日.

I wouldn't expect full support from CPython or GitHub for another few weeks. This PR is way ahead of schedule.
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It was worth a try and could have worked. We shall wait then :)

@niccokunzmann niccokunzmann changed the title (削除) Add support for Python 3.15 (削除ここまで) (追記) [WIP] Add support for Python 3.15 - check again in October 2026 (追記ここまで) Aug 18, 2026
niccokunzmann marked this pull request as draft August 19, 2026 14:07
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@stevepiercy stevepiercy Awaiting requested review from stevepiercy stevepiercy is a code owner
@SashankBhamidi SashankBhamidi Awaiting requested review from SashankBhamidi

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Support Python 3.15

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