'''
from machine import Pin
from utime import sleep

LED1 = Pin(0, Pin.OUT)
LED2 = Pin(1, Pin.OUT)
LED3 = Pin(2, Pin.OUT)
LED4 = Pin(3, Pin.OUT)

while True:
    LED1.value(1)
    sleep(0.5)
    LED1.value(0)

    LED2.value(1)
    sleep(0.5)
    LED2.value(0)

    LED3.value(1)
    sleep(0.5)
    LED3.value(0)

    LED4.value(1)
    sleep(0.5)
    LED4.value(0)
'''
'''
# More efficient code

# From PDF
from machine import Pin
from utime import sleep

LEDs = [0, 1, 2, 3]             # LED Ports
L = [0, 0, 0, 0]

for i in range(4):
    L[i] = Pin(LEDs[i], Pin.OUT)

while True:
    for i in range(4):
        L[i].value(1)
        sleep(0.5)
        L[i].value(0)
'''

# Rounak Khuntia's Code
from machine import Pin
from utime import sleep
 
while True:
    for led in range(4):
        Pin(led, Pin.OUT).value(1)
        sleep(1)
        Pin(led, Pin.OUT).value(0)

'''
# Manaswini Ray's Code
from machine import Pin
from utime import sleep
 
LED1 = Pin(0,Pin.OUT)
LED2 = Pin(1,Pin.OUT)
LED3 = Pin(2,Pin.OUT)
LED4 = Pin(3,Pin.OUT)
 
led_pins = [LED1, LED2, LED3, LED4]
 
while True:
    for led in led_pins:
        led.value(1)
        sleep(0.5)
        led.value(0)
'''