双鱼图

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#!/usr/bin/env python3
"""       turtle-example-suite:

            tdemo_yinyang.py

Another drawing suitable as a beginner's
programming example.

The small circles are drawn by the circle
command.

"""

from turtle import *

def yin(radius,color1,color2):
    width(3)
    color("black",color1)
    begin_fill()
    circle(radius/2.,180)
    circle(radius,180)
    left(180)
    circle(-radius/2.,180)
    end_fill()
    left(90)
    up()
    forward(radius*0.35)
    right(90)
    down()
    color(color1,color2)
    begin_fill()
    circle(radius*0.15)
    end_fill()
    left(90)
    up()
    backward(radius*0.35)
    down()
    left(90)

def main():
    reset()
    yin(200,"black","white")
    yin(200,"white","black")
    ht()
    return "Done!"

if __name__ == '__main__':
    main()
    mainloop()

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