Never-ending rainbow effect in Boston Python Workshop's ColorWall project https://openhatch.org/wiki/Boston_Python_Workshop_7/Friday/OSX_project_dependencies

unending-rainbow.py

def RainbowTest(wall):
    print "RainbowTest"

    rainbowColors = [ colors["red"], colors["orange"], colors["yellow"], colors["green"], colors["baby blue"], colors["blue"], colors["purple"] ]
    i = 0
    for y in range( wall.height ):
        color = rainbowColors[ i ]
        i += 1
        if i == 7:
            i = 0

        for x in range( wall.width ):
            wall.set_pixel( x, y, color )

        wall.draw()
        time.sleep( 0.2 )

    wall.clear()
    RainbowTest( wall )