Switch Interfacing with Raspberry Pi | Digital Input with Raspberry Pi

import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BOARD)
GPIO.setup(18, GPIO.IN, pull_up_down=GPIO.PUD_UP)

while True:
    input_state=GPIO.input(18)
    if input_state == False:
        print('Botton pressed')
    else:
        print('Buttom not pressed')
    time.sleep(1)