1 #!/usr/bin/python

     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")

    19     fill(True)

    20     circle(radius/2., 180)

    21     circle(radius, 180)

    22     left(180)

    23     circle(-radius/2., 180)

    24     color(color1)

    25     fill(True)

    26     color(color2)

    27     left(90)

    28     up()

    29     forward(radius*0.375)

    30     right(90)

    31     down()

    32     circle(radius*0.125)

    33     left(90)

    34     fill(False)

    35     up()

    36     backward(radius*0.375)

    37     down()

    38     left(90)

    39 

    40 def main():

    41     reset()

    42     yin(200, "white", "black")

    43     yin(200, "black", "white")

    44     ht()

    45     return "Done!"

    46 

    47 if __name__ == '__main__':

    48     main()

    49     mainloop()