save project

snake.py

@@ -52,6 +52,11 @@ while True:
     else:
         y += 30
     position.append((x, y))
+
+    if x==a_x and y==a_y:
+        a_x=random.randint(0,21)*30
+        a_y=random.randint(0,15)*30
+    else:
         position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))