def get_num_ufo_x(game_settings, screen):
ufo = Ufo(game_settings, screen)
ufo_width = ufo.get_size()[0]
availible_space_x = game_settings.get_screen_size()[0] - 2 * ufo_width
return int(availible_space_x /(2 * ufo_width))
def get_num_ufo_rows(game_settings, screen, ship):
ufo = Ufo(game_settings, screen)
ufo_height = ufo.get_size()[1]
available_space_y = (game_settings.get_screen_size()[1] - (3 * ufo_height) - ship.get_size()[1])
return int(available_space_y / (2 * ufo_height))