from turtle import *def mygoto(x, y):    up()    goto(x, y)    down()def draw(r):    begin_fill()    for i in range(5):        forward(r)        right(144)    end_fill()setup(700, 500)bgcolor('red')color('yellow')speed(6)fillcolor('yellow')hideturtle()mygoto(-300, 150)draw(100)mygoto(-190, 220)draw(45)mygoto(-140, 150)draw(45)mygoto(-140, 90)draw(45)mygoto(-190, 40)draw(45)done()

字符串练习：

addr='http://news.gzcc.cn/html/2017/xiaoyuanxinwen_1027/8443.html'print(addr[-14:-5])

产生校园新闻的一系列新闻页网址:

>>> addr1='http://news.gzcc.cn/html/2017/xiaoyuanxinwen'>>> addr2='.html'>>> for i in range(2,10):    print(addr1+str(i)+addr2)

 

 

练习字符串内建函数：

>>> addr='    http://news.gzcc.cn/html/2017/xiaoyuanxinwen_1027/8443.html'>>> addr.strip
     
      >>> print(addr)    http://news.gzcc.cn/html/2017/xiaoyuanxinwen_1027/8443.html