The Python client version 2.0.0 is available on PyPI: https://pypi.org/project/paho-mqtt/2.0.0/
For the details of changes see the change log or the Github release:
* https://github.com/eclipse/paho.mqtt.python/blob/v2.0.0/ChangeLog.txt
* https://github.com/eclipse/paho.mqtt.python/releases/tag/v2.0.0
This release had breaking change, see migrations[1] for how to upgrade. For most users adding "mqtt.CallbackAPIVersion.VERSION1" when creating the Client() class should be enough.
This release also introduce a Sphinx based documentation available online[2]. The style is still rather rough, but I avoid having duplicated documentation in README and in docstring, which were not always aligned.
Regards,
Pierre Fersing
[1]: https://eclipse.dev/paho/files/paho.mqtt.python/html/migrations.html
[2]: https://eclipse.dev/paho/files/paho.mqtt.python/html/index.html