Undefined CallbackAPIVersion

[Helios06]

Under PyCharm a simple project using python 3.8.5 and venv leads to this error even so the package installed is paho-mqtt v2.0.0

coding this

import paho.mqtt.client as mqtt
...... mqtt.CallbackAPIVersion.VERSION2 ..... leads to "cannot find reference 'CallbackAPIVersion'"

[Helios06]

I solved the problem by installing python 3.12

[MattBrittan]

I checked (under Docker) using the basic example app and:

• 3.8.5 - Runs fine
• 3.7 need typing_extensions (e.g. pip install typing_extensions) or you will get a ImportError: cannot import name 'Literal' from 'typing' (/usr/local/lib/python3.7/typing.py).

I suspect you may have had an older version of the library installed in your environment?