#引用库
import turtle
#设置海龟
turtle.shape("turtle")
turtle.pensize(6)
turtle.title("八卦图")
turtle.Screen().bgcolor("yellow")
turtle.colormode(255)
#画黑色的一半
turtle.color(0,0,0)
turtle.fillcolor(0,0,0)
turtle.begin_fill()
turtle.circle(100,180)
turtle.circle(50,180)
turtle.circle(-50,180)
turtle.end_fill()
#画白色的一半
turtle.fillcolor(255,255,255)
turtle.color(255,255,255)
turtle.begin_fill()
turtle.circle(-100,180)
turtle.left(180)
turtle.circle(50,180)
turtle.circle(-50,180)
turtle.end_fill()
#黑色小圆
turtle.penup()
turtle.right(90)
turtle.forward(25)
turtle.right(90)
turtle.fillcolor(0,0,0)
turtle.color(0,0,0)
turtle.pendown()
turtle.begin_fill()
turtle.circle(25)
turtle.end_fill()
#白色小圆
turtle.penup()
turtle.fillcolor(255,255,255)
turtle.color(255,255,255)
turtle.left(90)
turtle.forward(100)
turtle.right(90)
turtle.pendown()
turtle.begin_fill()
turtle.circle(25)
turtle.end_fill()
turtle.hideturtle()