"storing bullets in a group" s248

alien_invasion.py

@@ -33,18 +33,26 @@ def _check_events(self):
          for event in pygame.event.get():
             if event.type == pygame.QUIT:
                 sys.exit()
-
             elif event.type == pygame.KEYDOWN:
-                if event.key == pygame.K_RIGHT:
-                    self.ship.moving_right = True
-                elif event.key == pygame.K_LEFT:
-                    self.ship.moving_left = True
-
+                self._check_keydown_events(event)
             elif event.type == pygame.KEYUP:
-                if event.key == pygame.K_RIGHT:
-                    self.ship.moving_right = False
-                elif event.key == pygame.K_LEFT:
-                    self.ship.moving_left = False
+                self._check_keyup_events(event)
+
+    def _check_keydown_events(self, event):
+        """Respond to keypresses."""
+        if event.key == pygame.K_RIGHT:
+            self.ship.moving_right = True
+        elif event.key == pygame.K_LEFT:
+            self.ship.moving_left = True
+        elif event.key == pygame.K_q:
+            sys.exit()
+
+    def _check_keyup_events(self, event):
+        """Respond to key releases."""
+        if event.key == pygame.K_RIGHT:
+            self.ship.moving_right = False
+        elif event.key == pygame.K_LEFT:
+            self.ship.moving_left = False
 
     def _update_screen(self):
             """Update images on the screen, and flip to the new screen."""

bullet.py

@@ -0,0 +1,32 @@
+import pygame
+from pygame.sprite import Sprite
+
+
+class Bullet(Sprite):
+    """A class to manage bullets fired from the ship."""
+
+    def __init__(self, ai_game):
+        """Create a bullet object at the ship's current position."""
+        super().__init__()
+        self.screen = ai_game.screen
+        self.settings = ai_game.settings
+        self.color = self.settings.bullet_color
+
+        # Create a bullet rect at (0, 0) and then set correct position.
+        self.rect = pygame.Rect(0, 0, self.settings.bullet_width,
+                                self.settings.bullet_height)
+        self.rect.midtop = ai_game.ship.rect.midtop
+
+        # Store the bullet's position as a float.
+        self.y = float(self.rect.y)
+
+    def update(self):
+        """Move the bullet up the screen."""
+        # Update the exact position of the bullet.
+        self.y -= self.settings.bullet_speed
+        # Update the rect position.
+        self.rect.y = self.y
+
+    def draw_bullet(self):
+        """Draw the bullet to the screen."""
+        pygame.draw.rect(self.screen, self.color, self.rect)

settings.py

@@ -9,4 +9,10 @@ def __init__(self):
         self.bg_color = (230, 230, 230)
 
         # Ship settings
-        self.ship_speed = 5
+        self.ship_speed = 5
+
+        # Bullet settings
+        self.bullet_speed = 2.0
+        self.bullet_width = 3
+        self.bullet_height = 15
+        self.bullet_color = (60, 60, 60)