字符串练习

字符串练习：

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

取得校园新闻的编号

 

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

 

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

产生python文档的网址

 

addr1 = 'http://docs.python.org/3/library/'
addr2 = '.html'
addr = addr1 + 'turtle' + addr2
print(addr)

 

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

产生校园新闻的一系列新闻页网址

 

for i in range(5):
        print('http://news.gzcc.cn/html/xiaoyuanxinwen/{}.html'.format(i))

 

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

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

 

用函数统计一歌词中单词出现的次数

str='''I'm a big big girl
　　In a big big world
　　It's not a big big thing if you leave me
　　But I do do feel
　　that I too too will miss you much
　　Miss you much.
I can see the first leaf falling
　　It's all yellow and nice
　　It's so very cold outside
　　Like the way I'm feeling inside
　　I'm a big big girl
　　In a big big world
　　It's not a big big thing if you leave me
　　But I do do feel
　　that I too too will miss you much
　　Miss you much.
Outside it's now raining
　　And tears are falling from my eyes
　　Why did it have to happen
　　Why did it all have to end
　　I'm a big big girl
　　In a big big world
　　It's not a big big thing if you leave me
　　But I do do feel
　　that I too too will miss you much
　　Miss you much.
I have your arms around me ooooh like fire
　　But when I open my eyes
　　You're gone.
I'm a big big girl
　　In a big big world
　　It's not a big big thing if you leave me
　　But I do do feel
　　that I too too will miss you much
　　Miss you much.
I'm a big big girl
　　In a big big world
　　It's not a big big thing if you leave me
　　But I do feel that will miss you much
　　Miss you much.'''
print(str.count('big'))

 

将字符串分解成一个个的单词。

str='good good study day day up'
print(str.split())

 定义字符串遍历

string='I Love Python'
for str in string:
    print(str)

定义列表遍历

course=['c','java','c++','python','go']
for cou in course:
    print(cou)

定义元组遍历

tuple=('c','java','c++','python','go')
# for tup in range(len(tuple)):
#     print(tuple[tup] )
for tup in tuple:
    print(tup)

  字典

dict = dict(zip('python', '123456'))
for i in dict:
    print(i)
for i in dict.keys():
    print(i)
for i in dict.values():
    print(i)
for i in dict.items():
    print(i)

集合

set={'c++','java','python','c'}
for i in set:
        print(i)