save project

snake.py

@@ -55,8 +55,10 @@ while True:
         y += 30
     position.append((x, y))
     if x==food_x and y==food_y:
-        food_x=randint(0,660)
-        food_y=randint(0,480)
+        num_x=randint(0,21)
+        num_y=randint(0,15)
+        food_x=num_x*30
+        food_y=num_y*30
     position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))