Raspberry pi is in a reboot-loop

I wrote this python program for my Raspberry Pi 3:

import time, os

time.sleep(20)
os.system("reboot")

I made an edit in the /etc/rc.local that the program will autostart.

The edit is only adding the following line before exit 0: python /home/pi/reboot.py

But now my Raspberry pi 3 is in a reboot loop. How can I delete the line I added in /etc/rc.local?

Answer

You should remove the SD card, mount the filesystem on the sd card on your linux machine and edit the files or the program in question.