画太极图

from turtle import *
pensize(3)
penup()
pencolor("black")
reset()
speed(10)
pendown()
circle(100,180)
circle(200,180)
circle(100,-180)
fillcolor('black')
begin_fill()
circle(100,180)
circle(200,180)
circle(100,-180)
end_fill()
penup()
goto(0,100)
dot(50)
goto(0,-100)
pencolor('white')
dot(50)
hideturtle()