lights.py

#!/usr/bin/python

import tree

# Some constants to identify each LED
L0 = 1
L1 = 2
L2 = 4
L3 = 8
L4 = 16
L5 = 32
L6 = 64
ALL = 1+2+4+8+16+32+64
NO_LEDS = 0

tree.setup() # you must always call setup() first!

# Pattern: flash each LED in turn
x = 1
while x == 1:
    try:
        for i in range (2):
            tree.leds_on_and_wait(L0, 0.3) # LED 0 on for 0.3 seconds
            tree.leds_on_and_wait(L1, 0.3) # LED 1 on for 0.3 seconds
            tree.leds_on_and_wait(L2, 0.3) # etc.
            tree.leds_on_and_wait(L3, 0.3)
            tree.leds_on_and_wait(L4, 0.3)
            tree.leds_on_and_wait(L5, 0.3)
            tree.leds_on_and_wait(L6, 0.3)

        for i in range (2):
            tree.leds_on_and_wait(L4+L5, 1)
            tree.leds_on_and_wait(L0+L2, 1)
            tree.leds_on_and_wait(L3+L6+L1, 1)

        for i in range (3):
            tree.leds_on_and_wait(ALL, 0.8)
            tree.leds_on_and_wait(NO_LEDS, 0.8)

        for i in range (6):
            tree.leds_on_and_wait(L6, 0.1)
            tree.leds_on_and_wait(L5, 0.1)
            tree.leds_on_and_wait(L4, 0.1)
            tree.leds_on_and_wait(L3, 0.1)
            tree.leds_on_and_wait(L2, 0.1)
            tree.leds_on_and_wait(L1, 0.1)
            tree.leds_on_and_wait(L0, 0.1)

        for i in range (3):
            tree.leds_on_and_wait(ALL, 0.8)
            tree.leds_on_and_wait(NO_LEDS, 0.8)
            
    except (KeyboardInterrupt, SystemExit):
        tree.all_leds_off() # extinguish all LEDs
        # All done!
        tree.cleanup() # call cleanup() at the end