import turtle
turtle.penup()
turtle.pendown()
turtle.pencolor("black")
turtle.fd(50)
for i in range(4):
turtle.left(72)
turtle.fd(50)
turtle.penup()
turtle.left(90)
turtle.fd(25)
turtle.right(90)
turtle.fd(25)
turtle.left(144)
turtle.pendown()
turtle.fd(50)
for i in range(4):
turtle.left(72)
turtle.fd(50)
修改哪里才可以变成这个效果
![图片说明](https://img-ask.csdn.net/upload/201809/13/1536842877_510803.png)