Flowing LED Lights

#!/usr/bin/env python

import RPi.GPIO as GPIO
import time

# Set 8 Pins for 8 LEDs.
LedPins = [17, 18, 27, 22, 23, 24, 25, 4]

# Define a function to print message at the beginning
def print_message():
        print ("========================================")
        print ("|                8 LEDs                |")
        print ("|    ------------------------------    |")
        print ("|         LED0 connect to GPIO0        |")
        print ("|         LED1 connect to GPIO1        |")
        print ("|         LED2 connect to GPIO2        |")
        print ("|         LED3 connect to GPIO3        |")
        print ("|         LED4 connect to GPIO4        |")
        print ("|         LED5 connect to GPIO5        |")
        print ("|         LED6 connect to GPIO6        |")
        print ("|         LED7 connect to GPIO7        |")
        print ("|                                      |")
        print ("|            Flow LED effect           |")
        print ("|                                      |")
        print ("|                            SunFounder|")
        print ("========================================\n")
        print 'Program is running...'
        print 'Please press Ctrl+C to end the program...'
        raw_input ("Press Enter to begin\n")

# Define a setup function for some setup
def setup():
        # Set the GPIO modes to BCM Numbering
        GPIO.setmode(GPIO.BCM)
        # Set all LedPin's mode to output,
        # and initial level to High(3.3v)
        GPIO.setup(LedPins, GPIO.OUT, initial=GPIO.HIGH)

# Define a main function for main process
def main():
        # Print messages
        print_message()
        leds = ['-', '-', '-', '-', '-', '-', '-', '-']

        while True:
                # Turn LED on from left to right
                print "From left to right."
                for pin in LedPins:
                        #print pin
                        GPIO.output(pin, GPIO.LOW)
                        leds[LedPins.index(pin)] = 0    # Show which led is on
                        print leds
                        time.sleep(0.5)
                        GPIO.output(pin, GPIO.HIGH)
                        leds[LedPins.index(pin)] = '-'  # Show the led is off

                # Turn LED off from right to left
                print "From right to left."
                for pin in reversed(LedPins):
                        #print pin
                        GPIO.output(pin, GPIO.LOW)
                        leds[LedPins.index(pin)] = 0    # Show which led is on
                        print leds
                        time.sleep(0.5)
                        GPIO.output(pin, GPIO.HIGH)
                        leds[LedPins.index(pin)] = '-'  # Show the led is off

# Define a destroy function for clean up everything after
# the script finished
def destroy():
        # Turn off all LEDs
        GPIO.output(LedPins, GPIO.HIGH)
        # Release resource
        GPIO.cleanup()

# If run this script directly, do:
if __name__ == '__main__':
        setup()
        try:
                main()
        # When 'Ctrl+C' is pressed, the child program
        # destroy() will be  executed.
        except KeyboardInterrupt:
                destroy()