save project

snake.py

@@ -54,10 +54,13 @@ while True:
     else:
         y += 30
     if x==food_x and y==food_y:
-        food_y=random.randint(0,450)
-        food_x=random.randint(0,630)
+        a=random.randint(1,16)
+        b=random.randint(1,22)
+        food_x=a*30-30
+        food_y=b*30-30
+    else:
+        position.pop(0)
     position.append((x, y))
-    position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去