from machine import Pin
from time import sleep

buttonPin   = [12, 13, 14]
ledPin      = [15, 4, 19, 21]

ledList = [Pin(_, Pin.OUT) for _ in ledPin]
btnList = [Pin(_, Pin.IN, Pin.PULL_UP) for _ in buttonPin]

def onLed(delayTime = 0):
    for i in ledList:
        i.on()
        sleep(delayTime)
        
def offLed(delayTime = 0):
    for i in ledList:
        i.off()
        sleep(delayTime)

while True:
    if btnList[0].value() == 0:
        onLed(0.3)
        offLed()
    elif btnList[1].value() == 0:
        onLed()
        offLed(0.3)
    elif btnList[2].value() == 0:
        onLed()
        sleep(0.3)
        offLed()
    sleep(0.1)