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.