字符串练习：

http://news.gzcc.cn/html/2017/xiaoyuanxinwen_1027/8443.html

取得校园新闻的编号

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

docs.python.org/3/library/turtle.html

产生python文档的网址

abb1="http://doc.python.org/3/library/"abb2=".html"abb3="turtle"print(abb1+abb3+abb2)

http://news.gzcc.cn/html/xiaoyuanxinwen/4.html

产生校园新闻的一系列新闻页网址

add1="http://news.gzcc.cn/html/xiaoyuanxinwen"add2=".html"for i in range(2,10):    add=add1 + str(i) + add2    print(add)

练习字符串内建函数：strip,lstrip,rstrip,split,count

用函数得到校园新闻编号

a="http://news.gzcc.cn/html/2017/xiaoyuanxinwen_1027/8443.html"print(a.rstrip(".html").split("_")[1])

用函数统计一歌词中单词出现的次数

sing=""" 想带你逃学看一场演唱会 想你难过时在我怀中流泪 想和你背包走遍天南地北 想你共我尝尽人生的滋味 想下雨时小伞中有你依偎 想把酒言欢时也有你作陪 想我们做的风筝它也会飞 有你在身边就很美 简简单单 不说未来 平平淡淡 心口难开 我想我也许不够坏 离开眼泪就掉下来 忙忙乱乱 头脑空白 磕磕绊绊 总受伤害 这一次我要够勇敢 和过去说拜拜"""print(sing.count("想"))

将字符串分解成一个个的单词。

article="""China is a big old country and it has a history of more than five thousand years.We are proud of its culture and part of the culture even influences the world greatly. For example, the thought of Confucius. As Chinese economy develops very fast and plays an important role in the world,more and more foreigners learn mandarin in Confucius institutions. The essence of Chinese traditional culture can be tested by the time. It units the whole nation and no matter what kinds of disaster comes, we will fight together for the country’s future. Today, many young people lose faith in traditional culture and they are crazy for the western culture. They follow the western fashion and think we are the old style.But some day, they will realize they are wrong to abandon traditional culture."""a1=article.replace(","," ").replace("."," ").replace("  "," ").replace("’"," ").replace("\n","").split(" ")print(a1)