python中使用turtle库绘制一个叠加等边三角形，绘制中线条宽度、颜色、填充、箭头等效果不限。

import turtle

turtle.screensize(300, 300, "black")
turtle.setup(800, 500, 100)
turtle.penup()
turtle.fd(-100)
turtle.pendown()
turtle.pensize(7)
turtle.pencolor("green")
turtle.seth(-40)
turtle.fd(90)
turtle.right(60)
turtle.fd(90)
turtle.right(120)
turtle.fd(180)
turtle.right(120)
turtle.fd(180)
turtle.right(120)
turtle.fd(90)
turtle.right(60)
turtle.fd(90)
turtle.right(120)
turtle.fd(90)
turtle.done()