turtle绘制科赫雪花

代码如下：

import turtle

def koch(size, n):
    if n == 0:
        turtle.fd(size)
    else:
        for angle in [0, 60, -120, 60]:
            turtle.left(angle)
            koch(size/3, n-1)


def main():
    turtle.setup(600,600)
    turtle.penup()
    turtle.goto(-200, 100)
    turtle.pendown()
    turtle.pensize(2)
    level = 1       # 3阶科赫雪花，阶数
    koch(400, level)
    turtle.right(120)
    koch(400, level)
    turtle.right(120)
    koch(400, level)
    turtle.hideturtle()
    turtle.penup()
    turtle.goto(-120,-80)
    turtle.pendown()

    turtle.done()


main()

 效果展示：