settings.py

class Settings:
	"""a class to store all settings for alien invasion"""

	def __init__(self):
		"""Initialize the game's static settings"""
		# screen settings
		self.screen_width = 1200
		self.screen_height = 750
		self.bg_color = (0, 0, 0)

		# ship settings
		self.ship_limit = 2

		# Bullet settings
		self.bullet_width = 5 # original setting is 3
		self.bullet_height = 15
		self.bullet_color = (230,0,0)
		self.bullets_allowed = 4

		# Alien settings
		self.fleet_drop_speed = 10

		# how quickly the game speeds up
		self.speedup_scale = 1.1

		# how quickly the alien point values increase
		self.score_scale = 1.5

		self.initialize_dynamic_settings()

	def initialize_dynamic_settings(self):
		"""Initialize the settings that will change throughout the game"""
		self.ship_speed = 1.5
		self.bullet_speed = 3.0
		self.alien_speed = 1.0

		#fleet_direction of 1 represents right; -1 represents left
		self.fleet_direction = 1

		# scoring
		self.alien_points = 50

	def increase_speed(self):
		"""increase speed settings and alien point values"""
		self.ship_speed *= self.speedup_scale
		self.bullet_speed *= self.speedup_scale
		self.alien_speed *= self.speedup_scale
		self.alien_points = int(self.alien_points * self.score_scale)