画太极图

import turtle
import time
import random
rand1=random.randint(1,200)
turtle.fillcolor("black")
turtle.begin_fill()
turtle.circle(rand1,180)
turtle.end_fill ()
turtle.pencolor("white")
turtle.goto(0,0)
turtle.pencolor("black")
turtle.circle(-rand1,180)
turtle.pencolor("white")
turtle.goto(0,rand1)
turtle.pencolor("black")
turtle.fillcolor("white")
turtle.begin_fill()
turtle.circle(0.25*rand1)