save project

snake.py

@@ -60,14 +60,15 @@ while True:
         ya = n2 * 30
     else:
         position.pop(0)
-    
+    if x < 0 or x > 630 or y < 0 or y > 450:
+        exit()
     screen.blit(background, (0, 0))
     
     screen.blit(snake_head, position[-1])
     
     for i in range(len(position)-1):
         screen.blit(body, position[i])
-
+    
     screen.blit(food, (xa,ya))
     info = "Score:" + str(score)
     text = font.render(info,True,(0,0,0))