from machine import Pin
from time import sleep
swtch_1 = Pin(4,Pin.IN,Pin.PULL_DOWN)
swtch_2 = Pin(5,Pin.IN,Pin.PULL_DOWN)
swtch_3 = Pin(6,Pin.IN,Pin.PULL_DOWN)
led_sw1 =  Pin(1,Pin.OUT)
led_sw2 = Pin(2,Pin.OUT)
led_sw3 = Pin(3,Pin.OUT)

while True:
    if swtch_1.value() == 1:
        led_sw1.value(1)
        sleep(1)
        led_sw1.value(0)
        sleep(1)
        print("Ok _ sw1")
        
        if swtch_2.value() == 1:
            led_sw2.value(1)
            sleep(1)
            led_sw2
if swtch_2.value() == 1:
            led_sw2.value(1)
            sleep(1)
            led_sw2.value(0)
            sleep(1)
            print("OK sw2")
            
            if swtch_3.value() == 1:
                led_sw3.value(1)
                sleep(1)
                led_sw3.value(0)
                sleep(1)
                print("end of nested loop")