class Settings():
    """存储《外星人入侵》的所有设置类"""

    def __init__(self):
        """初始化游戏的设置"""
        # 屏幕设置
        self.screen_width = 1200
        self.screen_height = 800
        self.bg_color = (0, 233, 0)

        # 飞船的设置
        self.ship_speed_factor = 6

        # 子弹的设置
        self.bullet_speed_factor = 3
        self.bullet_width = 3
        self.bullet_height = 15
        self.bullet_color = (60, 60, 60)
        self.bullets_allowed = 3