Run Python Script in Background at Startup

The easiest way to do this is to run the script using crontab, but I would advise testing you script well first as you could make a script that causes problems.

$ crontab -e

and add the line:

@reboot /home/username/bin/python_script.py

Save and close, and then run

# update-rc.d cron defaults

Once you reboot the script will start automatically.