save project

snake.py

@@ -63,7 +63,9 @@ while True:
         apple_y=num2*30-30
         score+=10
     else:
-        position.pop(0)        
+        position.pop(0)
+    if x < 0 or x > 630 or y < 0 or y > 450: 
+        exit()     
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去
@@ -77,5 +79,6 @@ while True:
     # 刷新画面
     pygame.display.update()
     FPSCLOCK.tick(3)
-    info=my_font.render(info,True,(75,54,0))
-    score.blit(text,(540,10))
\ No newline at end of file
+    info='Score'+str(score)
+    text=my_font.render(info,True,(75,54,0))
+    screen.blit(text,(540,10))
\ No newline at end of file