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import turtle

__Pen = turtle.Pen()

#开始进入Python的世界
__Pen.clear()
k = 5
__Pen.penup()
__Pen.goto(0, (-100))
__Pen.setheading(90)
turtle.bgcolor("#000000")
__Pen.fillcolor("#ffffff")
while (1 + 1):
if (-100 > __Pen.ycor()):
k = 5
__Pen.forward(k)
k -= 0.1

 

 

 

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