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import turtle turtle.bgpic("desert.gif") turtle.tracer(0) pen = turtle.Pen() # 空投箱 turtle.addshape("guitar.gif") pen.shape("guitar.gif") pen.penup() pen.goto(0,400) pen.pendown() # 画笔准备 pen.pencolor("coral") pen.left(90) while pen.ycor()>-200:   pen.forward(100)   for i in range(150):     pen.pensize(i*1.5)     pen.forward(1)   pen.pensize(1)   pen.backward(250)   turtle.update()   pen.backward(1)   pen.clear()