(x, y)
Change pacman aim if valid.
Change pacman aim if valid.
Change pacman aim if valid .
def change(x, y):
    "Change pacman aim if valid."
    if valid(pacman + vector(x, y)):
        aim.x = x
        aim.y = y
def change ( x , y ) : if valid ( pacman + vector ( x , y ) ) : aim . x = x aim . y = y