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      1 #!/usr/bin/env python3
      2 """       turtle-example-suite:
      3 
      4             tdemo_yinyang.py
      5 
      6 Another drawing suitable as a beginner's
      7 programming example.
      8 
      9 The small circles are drawn by the circle
     10 command.
     11 
     12 """
     13 
     14 from turtle import *
     15 
     16 def yin(radius, color1, color2):
     17     width(3)
     18     color("black", color1)
     19     begin_fill()
     20     circle(radius/2., 180)
     21     circle(radius, 180)
     22     left(180)
     23     circle(-radius/2., 180)
     24     end_fill()
     25     left(90)
     26     up()
     27     forward(radius*0.35)
     28     right(90)
     29     down()
     30     color(color1, color2)
     31     begin_fill()
     32     circle(radius*0.15)
     33     end_fill()
     34     left(90)
     35     up()
     36     backward(radius*0.35)
     37     down()
     38     left(90)
     39 
     40 def main():
     41     reset()
     42     yin(200, "black", "white")
     43     yin(200, "white", "black")
     44     ht()
     45     return "Done!"
     46 
     47 if __name__ == '__main__':
     48     main()
     49     mainloop()
     50