使用turtle库画太极图

太极图是一种传统的中国文化图案，可以使用turtle库轻松绘制。以下是绘制太极图的代码示例：

import turtle

# 绘制半圆
def draw_half_circle(radius, color):
    turtle.fillcolor(color)
    turtle.begin_fill()
    turtle.circle(radius, 180)
    turtle.circle(radius/2, 180)
    turtle.end_fill()

# 绘制太极图
def draw_taiji(size):
    turtle.speed(0)
    turtle.penup()
    turtle.goto(0, -size)
    turtle.pendown()

    # 绘制黑白两个半圆
    draw_half_circle(size, "black")
    draw_half_circle(size, "white")

    # 绘制两个小圆和两条直线
    turtle.fillcolor("black")
    turtle.penup()
    turtle.goto(0, -size/2)
    turtle.pendown()
    turtle.begin_fill()
    turtle.circle(size/4)
    turtle.end_fill()

    turtle.fillcolor("white")
    turtle.penup()
    turtle.goto(0, size/2)
    turtle.pendown()
    turtle.begin_fill()
    turtle.circle(size/4)
    turtle.end_fill()

    turtle.penup()
    turtle.goto(0, 0)
    turtle.pendown()
    turtle.pensize(3)
    turtle.right(90)
    turtle.forward(size/2)
    turtle.right(90)
    turtle.forward(size)
    turtle.right(180)
    turtle.forward(size/2)
    turtle.right(90)
    turtle.forward(size/4)
    turtle.right(90)
    turtle.forward(size/2)

    # 隐藏画笔
    turtle.hideturtle()

# 设置画布和画笔
turtle.setup(500, 500)
turtle.pensize(2)

# 绘制太极图
draw_taiji(200)

# 点击画布退出
turtle.exitonclick()

运行后，可以看到一个黑白相间的太极图。点击画布可以退出程序。