added new variable tha tcheck in with mode now screen is
fullscreen = False
Used new event type
if event.type == pygame.KEYDOWN:
When pressing key m we making new screen surface in fullscreen mode. If screen is in fuulscreen mode make window.
if event.key == pygame.K_m:
if not fullscreen:
screen = pygame.display.set_mode( (SCREEN_X,SCREEN_Y) , pygame.FULLSCREEN )
fullscreen = True
else:
screen = pygame.display.set_mode( (SCREEN_X,SCREEN_Y) )
fullscreen = False