python生成的彩虹效果，大家可以参考：
使用的python版本：3.7.0 ，以下为源代码：
# 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()
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