Python精灵模块的stampbbox指令

import random
from sprites import Screen,Sprite

screen = Screen()
screen.setup(480,360)

bug = Sprite(pos=(-170,0))
for i in range(8):  # 准备盖8个图章
    bug.stamp()
    bug.fd(50)
bug.hide()
# 随机选择一个图章的编号
r = random.choice(bug.stampItems)
print(bug.stampbbox(r))