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import turtle import time #画笔准备 pen = turtle.Pen() turtle.bgpic("battle.gif") turtle.addshape("light.gif") pen.shape("light.gif") turtle.addshape("hurt.gif") for i in range(3):   pen.speed(0)   pen.penup()   pen.goto(200,-50)   while pen.xcor()>-300:     pen.backward(5)   pen.shape("hurt.gif")   time.sleep(0.5)   pen.shape("light.gif")     pen.hideturtle() turtle.bgpic("KO.gif")