from machine import Pin
import time
led1=Pin(16,Pin.OUT)
led2=Pin(17,Pin.OUT)
led3=Pin(18,Pin.OUT)
led4=Pin(19,Pin.OUT)
sw1=Pin(12,Pin.IN)
led=[led1,led2,led3,led4]
state=0

while 1:
    if sw1.value()==1:
        led1.off()
        if state==0:
            led2.on()
        else:
            led2.off()
        state=~state #invert 0 and 1
        
        while sw1.value():
            time.sleep_ms(10)
    else:
        led1.on()