如何用python画叠加三角形？

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python中可以使用下面的程序实现画叠加三角形：
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import turtle def drawTriangle(num,len,flag):#flag用来调整画三角形的方向     flag*=-1     len/=2     if(num==1):         if(flag==1):             turtle.left(60)             turtle.fd(len)             turtle.right(120)             turtle.fd(len)             turtle.right(120)             turtle.fd(len)             turtle.left(120)         else:             turtle.right(60)             turtle.fd(len)             turtle.left(120)             turtle.fd(len)             turtle.left(120)             turtle.fd(len)             turtle.right(120)     else:         if(flag==1):             turtle.left(60)             turtle.fd(len/2)             num=num-1             turtle.right(60)             drawTriangle(num,len,flag)             turtle.fd(len/2)             turtle.right(120)             turtle.fd(len)             turtle.right(120)             turtle.fd(len)             turtle.left(120)#注意递归过程中画笔返回的角度         else:             turtle.right(60)             turtle.fd(len/2)             num=num-1             turtle.left(60)             drawTriangle(num,len,flag)             turtle.fd(len/2)             turtle.left(120)             turtle.fd(len)             turtle.left(120)             turtle.fd(len)             turtle.right(120)#注意递归过程中画笔返回的角度          def main():     turtle.setup(600,600, 200, 200)     turtle.pendown()     turtle.speed(2)     turtle.pensize(5)     drawTriangle(5,512,-1)     turtle.hideturtle()#隐藏画笔图标 main() turtle.done()

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