save project

snake.py

@@ -50,8 +50,11 @@ while True:
     elif setheading == "up":
         y -= 30
     else:
-        y += 30
+        y += 30    
     position.append((x, y))
+    if x == apple_x and y == apple_y:
+        apple_x = random.randint(0,660)
+        apple_y = random.randint(0,480)
     position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))