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风车的动画，过程如下：1）绘制风车形状A，2）擦除风车形状A，3）绘制风车形状B，4）擦除风车形状B...以此类推
在运行中，用clear()擦除风车形状效果不好，会出现闪屏的情况，所以采用变通的办法，用背景色再绘制一遍以达到视觉上擦除的效果，即：
1）绘制风车形状A，2）用背景色绘制风车形状A，3）绘制风车形状B，4）用背景色绘制风车形状B...以此类推
import turtle turtle.pensize(2) turtle.hideturtle() windSpeed = 2 radius = 50
def windmill(c): turtle.pencolor(c) turtle.tracer(False)
#隐藏绘制过程，没有动画，只有绘制完成的图画，之后用update()直接出图 for i in range(4):
turtle.forward(2*radius) turtle.right(90) turtle.circle(-radius,180) while
True: windmill('black') turtle.update() #刷新图画 windmill('white')
#在此用背景色白色重绘风车，以此清除之前的黑色轨迹，而没有采用清屏函数 turtle.right(windSpeed) turtle.done()
