from machine import Pin 
import time 
led = Pin (4,Pin.OUT)
switch = Pin(0,Pin.IN,Pin.PULL_DOWN)
def appuyer_sur_switch(duree):
    while True : 
        if switch.value()==0:
            led.on()
        else:
            led.off()
        time.sleep(0.1)
appuyer_sur_switch(1)