from machine import Pin
from time import sleep
gpio=[0,1,2,3,4,5,6,7] #list of the number of gpio pins used for leds
led= len(gpio) # the number of the used leds pins
leds=[0]* led # list to save the declaration of leds pins
p_b= Pin(17, Pin.IN , Pin.PULL_DOWN) # decleration of push button 
for i in range(led):
    leds[i]= Pin(gpio[i], Pin.OUT) # a loop used to declare the leds pins
free= False # a flag to check if the button was bushed

while True: 
    if p_b.value() == 0:  
        for n in range (led): # a loop used for running lights when the push button is not pressed
            leds[n].value(1)
            sleep(0.2)
            leds[n].value(0)
            if p_b.value() == 1: # to reverse the order if button was pushed after this loop
                free= True
       
    if free == True:
        for n in range (led-1,-1,-1):  # a loop used for running lights when the push button is pressed
            leds[n].value(1)
            sleep(0.2)
            leds[n].value(0)
        free= False