settings.py

# -*- coding: utf-8 -*-

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 = 1275
		self.screen_height = 725
		self.bg_color = (255,255,255)

		# Ship settings
		self.ship_speed_factor = 1.5
		self.ship_limit = 3

		# Bullet settings
		self.bullet_speed_factor = 3
		self.bullet_width = 10
		self.bullet_height = 15
		self.bullet_color = (0,0,0)
		# self.bullets_allowed = 3 # to limit the no of bullets
		
		# Alien settings
		self.alien_speed_factor = 1
		# controls how quickly the fleet drops down 
		# the screen each time an alien reaches either edge. 
		self.fleet_drop_speed = 10
		# fleet_direction of 1 represents right; -1 represents left.
		self.fleet_direction = 1

		# How quickly the game speeds up
		self.speedup_scale = 1.1
		# How quickly the alien point values increase
		self.score_scale = 2
		self.initialize_dynamic_settings()

	def initialize_dynamic_settings(self):
		# Initialize settings that change throughout the game.
		self.ship_speed_factor = 1.5
		self.bullet_speed_factor = 3
		self.alien_speed_factor = 1
		# fleet_direction of 1 represents right; -1 represents left.
		self.fleet_direction = 1
		# Scoring
		self.alien_points = 10

	def increase_speed(self):
		# Increase speed settings and alien point values.
		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)
		print(self.alien_points)