turtle绘制螺旋花，附源码

import turtle
import colorsys as cs
turtle.speed(0)
turtle.width(2)
turtle.bgcolor('black')
for j in range(25):
    for i in range(15):
        turtle.color(cs.hsv_to_rgb(1/25,j/25,1))
        turtle.right(90)
        turtle.circle(200-j*4,90)
        turtle.left(90)
        turtle.circle(200-j*4,90)
        turtle.right(180)
        turtle.circle(50,24)
turtle.hideturtle()
turtle.done()

import turtle
import colorsys as cs
turtle.speed(0)
turtle.width(2)
turtle.bgcolor('black')
for j in range(25):
    for i in range(15):
        turtle.color(cs.hsv_to_rgb(1/25,j/25,1))
        turtle.right(90)
        turtle.circle(200-j*4,90)
        turtle.left(90)
        turtle.circle(200-j*4,90)
        turtle.right(180)
        turtle.circle(50,24)
turtle.hideturtle()
turtle.done()