save project

snake.py

@@ -64,6 +64,9 @@ while True:
         apple_y=num2*30-30
         apple_y=num2*30-30
     else:        
     else:        
         position.pop(0)
         position.pop(0)
+
+    if x>630 or x<0 or y>450 or y<0:
+        exit()
    
    
     # 将背景图画上去
     # 将背景图画上去
     screen.blit(background, (0, 0))
     screen.blit(background, (0, 0))