No fan with RaspiOS 64 bit Bullseye

[gnumojo]

Since updating RaspiOS 64 bit from Buster to Bullseye, the fan no longer comes on. It worked fine in Buster. Is there a way I can update the fan script to work with Bullseye? Thanks!

[gnumojo]

I was able to get it manually going by changing the path in fan.py from
#! /usr/bin/python
to
#! /usr/bin/python3
I can hear the fan speed changing based on my CPU load, so it seems to be working properly for now with this change.

[gnumojo]

fan.py doesn't automatically start on login, so I've copied the script to /usr/local/bin/fan.py and configured i3 to run it at login, which seems to be working. The reboot/power off button work fine.