import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)

A1 = 17
A2 = 27
B1 = 22
B2 = 23

GPIO.setup(A1, GPIO.OUT)
GPIO.setup(A2, GPIO.OUT)
GPIO.setup(B1, GPIO.OUT)
GPIO.setup(B2, GPIO.OUT)

while True:
        GPIO.output(A1, 0)
        GPIO.output(A2, 1)
        GPIO.output(B1, 0)
        GPIO.output(B2, 1)