函数定义与使用，字符串类型

import turtle
turtle.setup(600,400,0,0)
turtle.bgcolor('red')
turtle.color('yellow')
turtle.fillcolor('yellow')

def mygoto(x,y):
    turtle.penup()
    turtle.goto(x,y)
    turtle.pendown()

def draw5jx(r):
    turtle.begin_fill()
    for i in range(5):
        turtle.forward(r)
        turtle.right(144)
    turtle.end_fill()

mygoto(-250,100)
draw5jx(100)

mygoto(-115,165)
draw5jx(35)

mygoto(-75,115)
draw5jx(35)

mygoto(-75,55)
draw5jx(35)

mygoto(-115,5)
draw5jx(35)

turtle.done()

stunum='201709080003'
print('年级是：'+stunum[0:4])
print('专业编号是;'+stunum[4:9])
print('序号是：'+stunum[-3:])

IDNo = '440105199909211923'
print('性别是;'+ IDNo[-2])