why require tomli on Python 3.11/3.12?

[matrey]

The most recent release adds a dependency on tomli for Python < 3.13

https://github.com/confluentinc/confluent-kafka-python/blob/master/requirements/requirements.txt reads

tomli; python_version < "3.13"

2 questions about that:

1/ seems like only 2 places in code need toml capabilities:

• docs/conf.py
• tools/wheels/install-macos-python-required-by-cibuildwheel.py

But neither seem relevant to "runtime", end user use?

2/ Why < 3.13?

tomllib is shipped in standard lib since 3.11

cf https://docs.python.org/3/library/tomllib.html

tomllib — Parse TOML files
Added in version 3.11.

[MSeal]

Hi @matrey ,

Thanks for raising the issue. It looks like the tomli into main requirements was an accident in recent changes. We should fix that as it's just needed for docs / wheels in older Python versions.

Second, the wheel builds are split on 3.13 vs <=3.12 so the dep requirement was aligned to testing those semaphore builds rather than the exact version for internal compatibility. I don't recall if we also his any issues in 3.11/3.12 with the library compatibility wise but I think the bound was just a convenience of testing purpose.