ch gebe in der Console sudo python program.py ein und erhalte:

Traceback (most recent call last):
File "python001.py", line 4, in <module>
GPIO.setup(26, GPIO.OUT)
RPi.GPIO.ModeNotSetException: Please set mode using GPIO.setmode(GPIO.BOARD) or GPIO.setmode(GPIO.BCM)

Hier mein kleines Programm:

Code:
import RPi.GPIO as GPIO
import time

GPIO.setup(26, GPIO.OUT)

while True:
    GPIO.output(26, True)
    time.sleep(1)
    GPIO.output(26, False)
    time.sleep(1)