import time
import os

arr = ['.'] * 30

px = 1

def anim(arr):
        for n in range(30):
                print(arr[n],end="")
        print()

while True:
        anim(arr)
        arr[px] = '#'
        arr[px-1] = '.'
        px = px + 1
        time.sleep(.5)
        os.system("clear")
        time.sleep(.1)