from machine import Pin
import time
led = Pin(4, Pin.OUT) 
switch = Pin(0, Pin.IN, Pin.PULL_DOWN)  
def appuyer_sur_switch():
    while True:
        if switch.value() == 0:  
            led.on()             
        else:
            led.off()            
        time.sleep(0.1)          
appuyer_sur_switch()