save project

snake.py

@@ -63,8 +63,11 @@ while True:
         n2=random.randint(1,16)
         a_x=30*n1-30
         a_y=30*n2-30
+        score+=10
     else:
         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
@@ -75,7 +78,6 @@ while True:
 
     # 将果实画上去
     screen.blit(food, (a_x, a_y))
-
     info='Score:'+str(score)
     text=my_font.render(info,True,(0,0,0))
     screen.blit(text,(540,10))