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()

mygoto(-200,50)
turtle.begin_fill()
for i in range(5):
    turtle.forward(100)
    turtle.right(144)
turtle.end_fill()

####
mygoto(-100,125)
turtle.begin_fill()
for i in range(5):
    turtle.forward(50)
    turtle.right(145)
turtle.end_fill()

mygoto(-70,50)
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()

mygoto(-280,100)
turtle.begin_fill()
for i in range(5):
    turtle.forward(100)
    turtle.right(144)
turtle.end_fill()

####
mygoto(-100,180)
turtle.begin_fill()
for i in range(5):
    turtle.forward(50)
    turtle.right(144)
turtle.end_fill()

mygoto(-50,110)
turtle.begin_fill()
for i in range(5):
    turtle.forward(50)
    turtle.right(144)
turtle.end_fill()


mygoto(-40,50)
turtle.begin_fill()
for i in range(5):
    turtle.forward(50)
    turtle.right(144)
turtle.end_fill()

mygoto(-100,-10)
turtle.begin_fill()
for i in range(5):
    turtle.forward(50)
    turtle.right(144)

turtle.end_fill()

turtle.done()

stuNum = '201709090020'
print('年级是：'+stuNum[0:4])
print('专业编号是：'+stuNum[4:9])
print('序号是：'+stuNum[-3:])

IDNo = '440682199906256329'
print('性别是：'+IDNo[-2])