The way to implement a night rider loop like https://www.youtube.com/watch?time_continue=4&v=KY1kvakZ1cU - PiLiter https://shop.pimoroni.com/products/pi-liter-8-led-strip-for-the-raspberry-pi. See it running at https://repl.it/EWjf/0

night-rider-leds.py

from time import sleep

leds = [11, 14, 35, 67, 78, 89]

forward = range(len(leds))
backward = list(reversed(forward))

print forward
print backward

loop = 3
sleepTime = 0.08

while loop > 0:
  print "on(" + str(leds[0]) + ")"
  sleep(sleepTime)
  
  for i in forward:
    first = i
    second = i if i + 1 == len(forward) else i + 1

    if (first == second):
      continue

    print "# " + str(first) + ":" + str(second)
    print "off(" + str(leds[first]) + ") - on(" + str(leds[second]) + ")"
    sleep(sleepTime)

  for j in backward:
    second = j
    first = j if j + 1 == len(backward) else j + 1

    if (first == second) or (second == 0):
      continue

    print "# " + str(first) + ":" + str(second)
    print "off(" + str(leds[first]) + ") - on(" + str(leds[second]) + ")"
    sleep(sleepTime)

  print "off(" + str(leds[1]) + ")"
  
  loop = loop -1

output.log

$ python leds.py
[0, 1, 2, 3, 4, 5]
[5, 4, 3, 2, 1, 0]
on(11)
# 0:1
off(11) - on(14)
# 1:2
off(14) - on(35)
# 2:3
off(35) - on(67)
# 3:4
off(67) - on(78)
# 4:5
off(78) - on(89)
# 5:4
off(89) - on(78)
# 4:3
off(78) - on(67)
# 3:2
off(67) - on(35)
# 2:1
off(35) - on(14)
off(14)
on(11)
# 0:1
off(11) - on(14)
# 1:2
off(14) - on(35)
# 2:3
off(35) - on(67)
# 3:4
off(67) - on(78)
# 4:5
off(78) - on(89)
# 5:4
off(89) - on(78)
# 4:3
off(78) - on(67)
# 3:2
off(67) - on(35)
# 2:1
off(35) - on(14)
off(14)
on(11)
# 0:1
off(11) - on(14)
# 1:2
off(14) - on(35)
# 2:3
off(35) - on(67)
from time import sleep
# 3:4
off(67) - on(78)
# 4:5
off(78) - on(89)
# 5:4
off(89) - on(78)
# 4:3
off(78) - on(67)
# 3:2
off(67) - on(35)
# 2:1
off(35) - on(14)
off(14)