字符串操作练习：星座、凯撒密码、99乘法表、词频统计预处理

1、实例：输出12个星座符号，以反斜线分隔。

for i in range(12):
    print(chr(9800+i),end='\t')

 

2、实例：恺撒密码的编码。

r=input('请输入明文：')
print('输出明文：',end=' ')
for i in r:
    if ord('a')<=ord(i)<=ord('z'):
        print(chr(ord('a')+(ord(i)-ord('a')+3)%26),end=' ')
    else:
        print(i,end= ' ')

 

3、输入姓名，格式输出：占4位、居中、不足4字的以空格填充。

 

4、格式化输出：中华人民共和国国内生产总值(GDP)689,136.89亿元(2015年)（千分位、2位小数，浮点数）。

s=float(input('请输入GDP：'))
print('2015年国内GDP为{0:,.2f}亿元'.format(s))

 

5、实例：打出99乘法表。

for x in range(1,10):
    for y in range(1,x+1):
        print('{}*{}={}'.format(x,y,x*y),end=' ')
    print('\n')

 

6、实例: 下载一首英文的歌词或文章，统计单词出现的次数，将所有,.？！替换为空格，将所有大写转换为小写。

>>> cs='''Lately, I’ve been, I’ve been losing sleep
 Dreaming about the things that we could be
 But baby, I’ve been, I’ve been praying hard
 Said, no more counting dollars
 We’ll be counting stars
 Yeah we’ll be counting stars

 I see this life like a swinging vine
 Swing my heart across the line
 And my face is flashing signs
 Seek it out and you shall find
 Old, but I’m not that old
 Young, but I’m not that bold
 I don’t think the world is sold
 I’m just doing what we’re told

 I feel something so right
 Doing the wrong thing
 I feel something so wrong
 Doing the right thing
 I could lie, could lie, could lie
 Everything that kills me makes me feel alive

 Lately, I’ve been, I’ve been losing sleep
 Dreaming about the things that we could be
 But baby, I’ve been, I’ve been praying hard
 Said, no more counting dollars
 We’ll be counting stars

 Lately, I’ve been, I’ve been losing sleep
 Dreaming about the things that we could be
 But baby, I’ve been, I’ve been praying hard
 Said, no more counting dollars
 We’ll be, we’ll be counting stars

 I feel the love and I feel it burn
 Down this river, every turn
 Hope is a four-letter word
 Make that money, watch it burn
 Old, but I’m not that old
 Young, but I’m not that bold
 I don’t think the world is sold
 I’m just doing what we’re told

 I feel something so wrong
 Doing the right thing
 I could lie, could lie, could lie
 Everything that drowns me makes me wanna fly

 Lately, I’ve been, I’ve been losing sleep
 Dreaming about the things that we could be
 But baby, I’ve been, I’ve been praying hard
 Said, no more counting dollars
 We’ll be counting stars

 Lately, I’ve been, I’ve been losing sleep
 Dreaming about the things that we could be
 But baby, I’ve been, I’ve been praying hard
 Said, no more counting dollars
 We’ll be, we’ll be counting stars

 Take that money, watch it burn
 Sink in the river, the lessons are learnt
 Take that money, watch it burn
 Sink in the river, the lessons are learnt
 Take that money, watch it burn
 Sink in the river, the lessons are learnt
 Take that money, watch it burn
 Sink in the river, the lessons are learnt
 Everything that kills me makes feel alive

 Lately, I’ve been, I’ve been losing sleep
 Dreaming about the things that we could be
 But baby, I’ve been, I’ve been praying hard
 Said, no more counting dollars
 We’ll be counting stars

 Lately, I’ve been, I’ve been losing sleep
 Dreaming about the things that we could be
 But baby, I’ve been, I’ve been praying hard
 Said, no more counting dollars
 We’ll be, we’ll be, counting stars

 Take that money, watch it burn
 Sink in the river, the lessons are learnt
 Take that money, watch it burn
 Sink in the river, the lessons are learnt
 Take that money, watch it burn
 Sink in the river, the lessons are learnt
 Take that money, watch it burn
 Sink in the river, the lessons are learnt '''

统计money出现的次数：

 

将，替换为空格：

 

将所有大写转换为小写：

 

7、用webbrowser，uweb.open_new_tab('url')打开校园新闻列表。

>>> import webbrowser
>>> webbrowser.open_new_tab('http://news.gzcc.cn/html/xiaoyuanxinwen/ ')
True
>>>