Что означает данное выражение:

elif result=='reset'

del wormCoords [-1] 

OUTSIDE_DECORATION_PCT=20

invulnerableMode=False

apple = getRandomLocation()

assert WINDOWHEIGHT % CELLSIZE = = 0

assert WINDOWWIDTH % CELLSIZE = = 0

degrees 1 + = 3 # rotate by 3 degrees each time

elif (event.key == K_DOWN or event.key == K_s)