如何用python海龟库画彩虹

# rainbow.py

from turtle import *

from random import *

def HSB2RGB(hues):

    hues = hues * 3.59 #100转成359范围

    rgb = [0.0,0.0,0.0]

    i = int(hues/60) % 6

    f = hues/60 - i

    if i == 0:

        rgb[0] = 1; rgb[1] = f;rgb[2] = 0

    elif i == 1:

        rgb[0] = 1-f; rgb[1] = 1;rgb[2] = 0

    elif i == 2:

        rgb[0] = 0; rgb[1] = 1;rgb[2] = f

    elif i == 3:

        rgb[0] = 0; rgb[1] = 1-f;rgb[2] = 1

    elif i == 4:

        rgb[0] = f; rgb[1] = 0;rgb[2] = 1

    elif i == 5:

        rgb[0] = 1; rgb[1] = 0;rgb[2] = 1-f

    return rgb

def rainbow():

    hues = 0.0

    color(1,0,0)

    #绘制彩虹

    hideturtle()

    speed(100)

    pensize(3)

    penup()

    goto(-400,-300)

    pendown()

    right(110)

    for i in range(100):

        circle(1000)

        right(0.13)

        hues = hues + 1

        rgb = HSB2RGB(hues)

        color(rgb[0], rgb[1], rgb[2])

    penup()

def main():

    setup(800, 600, 0, 0)

    bgcolor((0.5, 0.8, 1.0))

    tracer(False)

    rainbow()

    #输出文字

    goto(100,-100)

    pendown()

    color("red")

    write("Rainbow",align="center",font=("Script MT Bold", 80, "bold"))

    tracer(True)

    mainloop()

if __name__ == '__main__':

    main()