def __init__(self, level=1):
self.level = level
self.background = ImageObject('background.png')
self.ship = ShipSprite()
self.bullets_group = pygame.sprite.Group()
self.enemy_group = pygame.sprite.Group()
self.inactive_group = pygame.sprite.Group()
self.level_file = open(
os.path.join('data', 'levels', 'level_%d.txt' % self.level))
self.level_file.readline(
) # First line indicates just limit of file width
