来自乡巴佬的挑战：你能盯着图看30秒还不眼花算你厉害，用Turtle海龟库绘制旋转蛇错觉图形

代码一共32行，应用Turtle海龟库，绘制了旋转蛇错觉图形。绘制的静止图片中，转盘仿佛一直在转动，看的我那是一个眼花缭乱，非常神奇。

参考代码：

from turtle import *
def drawPie(x, y, r, a1, a2, col):
    color(col)
    penup()
    goto(x, y)
    setheading(a1)
    pendown()
    forward(r)
    left(90)
    begin_fill()
    circle(r, a2-a1)
    left(90)
    forward(r)
    end_fill()
tracer(False)
hideturtle()
colormode(255)
bgcolor('gray')
totalOffset = 0
for centerX in range(-1000, 1200, 400):
    for centerY in range(-600, 800, 400): 
        for radius in range(200, 0, -50):
            for i in range(20):
                offset = i*18 + totalOffset 
                drawPie(centerX, centerY, radius, offset, offset+3, (0, 0, 0))
                drawPie(centerX, centerY, radius, offset+3, offset+9, (200, 0, 0))
                drawPie(centerX, centerY, radius, offset+9, offset+12, (255, 255, 255))
                drawPie(centerX, centerY, radius, offset+12, offset+18, (0, 240, 220))
            totalOffset = totalOffset + 9  
done()

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