settings.py

class Settings():
        def  __init__(self):
                self.screen_width = 600
                self.screen_height = 400
                self.bg_color = (0,0,0)
                self.ship_limit = 3
                self.bullet_width = 3
                self.bullet_height = 15
                self.bullet_color = 60,60,60
                self.bullets_allowed  = 50
                self.fleet_drop_speed = 2
                self.speedup_scale = 1.1
                self.initialize_dynamic_settings()
        def initialize_dynamic_settings(self):
                        self.ship_speed_factor = 1
                        self.bullet_speed_factor = 1
                        self.alien_speed_factor  = 1
                        self.fleet_direction = 1
        def increase_speed(self):
                        self.ship_speed_factor *=self.speedup_scale
                        self.bullet_speed_factor *= self.speedup_scale
                        self.alien_speed_factor *= self.speedup_scale