Python - abrir una lista cíclica

from time import sleep

while True:

    for i in range(16):

        print (i)

        sleep(5)

import time

fichero = open('1.txt', 'r')

#print (len(fichero.readlines())) # devolvera 3

n = len(fichero.readlines())

print (n)

fichero.close()

while n >  0:

    print(n)

    n = n - 1

with open('1.txt') as f:

    data = f.readlines()[n]

print(data)

        time.sleep(1)

print('FIN DE LISTA')