使用turtle库绘制一个叠加等边三角形，图形效果以下：

import turtle
turtle.setup(650,350,200,200)
turtle.penup()
turtle.pensize(1)
turtle.pencolor("red")
turtle.fillcolor("purple")
turtle.begin_fill()
turtle.seth(60)
turtle.pendown()
turtle.fd(50)
turtle.seth(-60)
turtle.fd(100)
turtle.seth(-180)
turtle.fd(100)
turtle.seth(60)
turtle.fd(50)
turtle.seth(0)
turtle.fd(50)
turtle.seth(-120)
turtle.fd(50)
turtle.seth(120)
turtle.fd(50)
turtle.end_fill()

printer = turtle.Turtle()
printer.hideturtle()
printer.penup()
printer.back(200)
printer.write(" from 欧锦涛", align="center", font=("黑体", 12, "normal"))