Test on Python 3.14

[cclauss]

https://www.python.org/downloads/release/python-3140/

• https://docs.python.org/3.14/whatsnew/3.14.html#pep-784-adding-zstandard-to-the-standard-library

Blocked by: -- Fixed in release v2.12.1 release -- https://github.com/confluentinc/confluent-kafka-python/releases

• Use compression.zstd (PEP-784) #2395 --or--
• Py3.14 Wheels confluentinc/confluent-kafka-python#2105
  • Python 3.14 Drops October 7th - Please Build Wheels Soon confluentinc/confluent-kafka-python#2085
  • Add Free-Threaded Python Support in 3.14 confluentinc/confluent-kafka-python#2092

[auvipy]

here is a old pr #2328

[cclauss]

The old PR tells us nothing useful because it fails before Py3.14 is installed.

Version “3.14-dev“ was not found in the local cache
Error: The version '“3.14-dev“' with architecture 'x64' was not found for Ubuntu 24.04.

[auvipy]

seems lots of dependency needed to be updated for 3.14 support.

[cclauss]

Remaining, I only see confluentinc/confluent-kafka-python#2048

• Getting free-threading working without the GIL is not trivial.

[auvipy]

as far as I know that is not the default yet, is it?

[cclauss]

Correct different executables...
% uv python install 3.14 # vs.
% uv python install 3.14t

[cclauss]

Do you have any ideas about how to get confluent-kafka-python to have a Py3.14 compatible release?

[auvipy]

no we just have to wait. generally it takes some time after the stable release to be supported across the eco system. so we have to wait.

[cclauss]

There is a new release v2.12.0 of confluent-kafka-python and librdkafka, but unfortunately, there is still no Py3.14 wheel to install the library with the Python code.

We could apt-get install the library and build from source on Py3.14 only, but it is probably better to wait.
https://github.com/confluentinc/confluent-kafka-python/blob/master/INSTALL.md#install-from-source-on-debian-or-ubuntu

• Python 3.14 Drops October 7th - Please Build Wheels Soon confluentinc/confluent-kafka-python#2085
• Add Free-Threaded Python Support in 3.14 confluentinc/confluent-kafka-python#2092

---

We also need to deal with the complexity of getting tox to test both python3.14 and python3.14t.

[auvipy]

we can skip kafka for 3.14 for a while if the other stuff work with 3.14. usually it takes a roughly a month to get the eco system catch up with latest python release.

[MSeal]

I'm actively working on releasing asap the kafka wheels for python 3.14 fyi

[cclauss]

confluent-kafka-python v2.12.1 seems to be helping us move forward.

• https://github.com/confluentinc/confluent-kafka-python/releases

[cclauss]

Thanks for making this happen @MSeal 🚀