pinstatus

#!/usr/bin/python3

from time import sleep
import RPi.GPIO as GPIO

while True:
    GPIO.setmode(GPIO.BCM)
    GPIO.setwarnings(False)

    GPIO.setup(20, GPIO.OUT)
    GPIO.output(20, GPIO.HIGH)
    print("GPIO 20 =",GPIO.input(20))  # returns 1

    sleep(4)
    GPIO.setup(20, GPIO.OUT)
    GPIO.output(20, GPIO.LOW)
    print ("GPIO 20 =",GPIO.input(20))  # returns 0