pi@raspberrypi:/opt/rpi-fan $ python3 rpi-fan.py Traceback (most recent call last): File "rpi-fan.py", line 24, in <module> import RPi.GPIO as GPIO File "/usr/lib/python3/dist-packages/RPi/GPIO/__init__.py", line 23, in <module> from RPi._GPIO import * RuntimeError: This module can only be run on a Raspberry Pi!