from machine import Pin
from time import sleep

Buttons= [Pin(pin, Pin.IN, Pin.PULL_DOWN) for pin in (1,2,3,4)]
led= Pin(0, Pin.OUT)
senha= ['1','2','3']

def verificar():
    for i in Buttons:
        if len(i) == 1:
            print("valor inicial")

while True: 
    verificar()