python海龟画图(1)太极图

import turtle as t
t.speed(10)
def arc1(r,d1,x,y,c):
    t.pu()
    t.goto(x,y)
    t.pd()
    t.seth(d1)
    t.begin_fill()
    t.fillcolor(c)
    t.pencolor(c)
    t.circle(r)
    t.end_fill()   
def arc2(r,d2,x,y,c):
    t.pu()
    t.goto(x,y)
    t.pd()
    t.begin_fill()
    t.fillcolor(c)
    t.pencolor(c)
    t.circle(r,d2)
    t.lt(90)
    t.fd(2*r)
    t.end_fill()
arc1(100,0,0,-200,"black")
arc2(200,180,0,-200,"black")
arc1(100,0,0,0,"white")
t.pu()
t.goto(0,200)
t.seth(180)
t.pencolor("black")
t.pd()
t.circle(200)
arc1(25,0,0,75,"black")
arc1(25,0,0,-125,"white")
t.ht()
t.exitonclick()