save project

snake.py

@@ -61,12 +61,15 @@ while True:
         y-=30
 
     if apple_x==x and apple_y==y:
-        apple_x=random.randint(0,660)
-        apple_y=random.randint(0,480)
+        num1=random.randint(0,21)
+        num2=random.randint(0,15)
+        apple_x=num1*30
+        apple_y=num2*30
+    else:
+        position.pop(0)
     
     # 添加元素并删除元素
     position.append((x,y))
-    position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去