第六部分

game_stats.py

@@ -0,0 +1,19 @@
+class GameStats():
+    """Track statistics for Alien Invasion."""
+    
+    def __init__(self, ai_settings):
+        """Initialize statistics."""
+        self.ai_settings = ai_settings
+        self.reset_stats()
+        
+        # Start game in an inactive state.
+        self.game_active = False
+        
+        # High score should never be reset.
+        self.high_score = 0
+        
+    def reset_stats(self):
+        """Initialize statistics that can change during the game."""
+        self.ships_left = self.ai_settings.ship_limit
+        self.score = 0
+        self.level = 1