unable to control GPIO from python

[ariutti]

Super useful tool,
thank you so much as always.

Just an issue I've with my RaspberryPi 3 model B+ after compiled, installed the script and run it as a service: I'm not able to check GPIO status from my python script anymore while shortening the pin to ground correctly shutdown the Pi (so, I think, the GPIOs are correctly working)

My system is:

  Operating System: Raspbian GNU/Linux 10 (buster)
            Kernel: Linux 4.19.50-v7+
      Architecture: arm

This is the python code I've always used to test my GPIOs with success:

import RPi.GPIO as GPIO
import time

myPins = [40, 36] 
PAUSE = 0.025

GPIO.setmode(GPIO.BCM)

for pin in myPins:
	GPIO.setup( pin, GPIO.IN, pull_up_down=GPIO.PUD_UP )

try:
	while(1):
		#read the input
		values = [GPIO.input(pin) for pin in myPins]
		print( values )
		time.sleep(PAUSE)
except:
	print("cleanup")
	GPIO.cleanup()

In the output I always see:

[1, 1]
[1, 1]
[1, 1]
[1, 1]
[1, 1]
[1, 1]
[1, 1]
[1, 1]

even if I'm actually shortening GPIO 21 an GPIO16 woth GND. Why?

Any ideas?
Thank you so much