settings.py

# settings.py
class Settings():
	"""存储外星人入侵的所有设置的类"""
	
	def __init__(self):
		"""初始化的静态设置"""
		# 屏幕设置
		self.screen_width = 1200
		self.screen_height = 600
		self.bg_color = (230, 230, 230)	
		
		# 飞船的设置
		self.ship_limit = 3		
		
		# 子弹的设置
		self.bullet_width = 3
		self.bullet_height = 15
		self.bullet_color = 60, 60, 60
		self.bullets_allowed = 3	
		
		# 外星人设置
		self.fleet_drop_speed = 10	
		
		# 以什么样的速度加快游戏节奏
		self.speedup_scale = 1.1
		self.score_scale = 1.5
		self.initialize_dynamic_settings()
	
	def initialize_dynamic_settings(self):
		"""初始化随游戏进行而变化的设置"""
		self.ship_speed_factor = 1.5
		self.bullet_speed_factor = 3
		self.alien_speed_factor = 1
		
		# fleet_direction = 1 表示向右， -1 表示向左
		self.fleet_direction = 1
		
		# 计分
		self.alien_points = 50
		
	def increase_speed(self):
		"""提高速度设置"""
		self.ship_speed_factor *= self.speedup_scale
		self.bullet_speed_factor *= self.speedup_scale
		self.alien_speed_factor *= self.speedup_scale
		self.alien_points = int(self.alien_points * self.score_scale )