Initial setup of game

alien_invasion.py

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+import sys
+
+import pygame
+
+class AlienInvasion:
+    """Overall class to manage game assets and behaviour."""
+
+    def __init__(self):
+        """Intialize the game, and create game resources"""
+        pygame.init()
+
+        self.screen = pygame.display.set_mode((1200, 800))
+        pygame.display.set.caption("Alien Invasion")
+
+        # Set the background color.
+        self.bg_color = (230, 230, 230)
+
+    def run_game(self):
+        """Start main loop for the game."""
+        while True:
+            # Watch for keyboard and mouse events.
+            for event in pygame.event.get():
+                if event.type == pygame.QUIT:
+                    sys.exit()
+
+            # Redraw the screen during each  pass through the loop.
+            self.screen.fill(self.bg_color)
+
+            # Make the most recently drawn screen visible.
+            pygame.display.flip()
+
+if __name__ == '__main__':
+    # Make  a game instance, and run the game.get()
+    ai = AlienInvasion()
+    ai.run.game()
+

settings.py

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+class Settings:
+    """A class to store all settings for alien invasion."""