字符串练习：

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

取得校园新闻的编号

 

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

 

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

产生python文档的网址

 

newshead='https://docs.python.org/3/library/'newsend='.html'print(newshead+str('turtle')+newsend)

 

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

产生校园新闻的一系列新闻页网址

news1='http://news.gzcc.cn/html/xiaoyuanxinwen/'news2='.html'for i in range(10):    news3=news1+str(i)+news2    print(news3)

 

 

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

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

 

用函数统计一歌词中单词出现的次数

song='''I've been reading books of oldThe legends and the mythsAchilles and his goldHercules and his giftsSpiderman's controlAnd Batman with his fistsAnd clearly I don't see myself upon that listShe said where'd you wanna goHow much you wanna riskI'm not looking for somebodyWith some Superhuman giftsSome SuperheroSome fairytale blissJust something I can turn toSomebody I can kissI want something just like thisDoo doo doo doo doo dooDoo doo doo doo dooDoo doo doo doo doo dooOh I want something just like thisDoo doo doo doo doo dooDoo doo doo doo dooDoo doo doo doo doo dooOh I want something just like thisI want something just like thisI've been reading books of oldThe legends and the mythsThe testaments they toldThe moon and its eclipseAnd Superman unrollsA suit before he liftsBut I'm not the kind of person that it fitsShe said where'd you wanna goHow much you wanna riskI'm not looking for somebodyWith some Superhuman giftsSome SuperheroSome fairytale blissJust something I can turn toSomebody I can missI want something just like thisI want something just like thisOh I want something just like thisDoo doo doo doo doo dooDoo doo doo doo dooDoo doo doo doo doo dooOh I want something just like thisDoo doo doo doo doo dooDoo doo doo doo dooDoo doo doo doo doo dooWhere'd you wanna goHow much you wanna riskI'm not looking for somebodyWith some Superhuman giftsSome SuperheroSome fairytale blissJust something I can turn toSomebody I can kissI want something just like thisOh I want something just like thisOh I want something just like thisOh I want something just like this'''print('some在歌曲里一共出现了'+ str(song.count('some')) +'次')

 

将字符串分解成一个个的单词。

str='Whered you wanna goHow much you wanna risk'print(str.split())

 

2.组合数据类型练习

分别定义字符串，列表，元组，字典，集合，并进行遍历。

字符串：

str='hiro'for s in str:    print(s)

列表：

ls=['h','i','r','o']for s in ls:    print(s)

 

元组：

tuple=('h','i','r','o')for s in tuple:    print(s)

 

字典：

dict = dict(zip('hiro', '5826'))for s in dict:    print(s)for s in dict.keys():     print(s)for s in dict.values():    print(s)for s in dict.items():    print(s)

 

集合：

set = (['hiro'],'hjkl')for i in set:    print(i)

 

总结列表，元组，字典，集合的联系与区别。

联系：

元组可以包含列表，列表衣可以包含元组。

他们能够相互转化。

区别：

元组和列表是有序列的，字典和集合是无序列。