python画图

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终于画出来这个螺旋线了，真好玩

四色螺旋线.png

附上代码：

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import turtle
turtle.bgcolor("black")
turtle.speed(9)
colors = ["red","blue","yellow","green"]

#turtle.tracer(False) 
for i in range(500):
    turtle.pencolor(colors[i%4])
    turtle.forward(i)
    turtle.left(95)
#turtle.tracer(True)
turtle.done()

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