字符串操作、文件操作，英文词频统计预处理

作业来源：https://edu.cnblogs.com/campus/gzcc/GZCC-16SE1/homework/2684

1.字符串操作：

• 解析身份证号：生日、性别、出生地等。

id = []
id=input('请输入身份证号:')
if len(id)!=18:
    print('身份证号码有误')
else:
    print("您的生日是"+id[6:14])
    sex=id[14:17]
    if int(sex)%2==0:
        print('您的性别为：女')
    else:
        print('您的性别为：男')
    sf=id[0:2]
    if int(sf)==441:
      print('广东省')
    shi=id[3]
    if int(shi)==5:
      print('汕尾'),
    qu=id[4:6]
    if int(qu)==81:
      print('陆丰')

• 
• 凯撒密码编码与解码

• # 凯撒密码编码
  code=input("请您输入文字：")
  print("转化成凯撒密码为")
  for i in code:
      print(chr(ord(i)+3),end='')

# 凯撒密码解码

code=input("请您输入凯撒密码：")
for i in code:
    print(chr(ord(i)-3),end='')

• 网址观察与批量生成

for i in range(1,11):
    url='http://news.gzcc.cn/html/2019/xiaoyuanxinwen_0305/{}.html'.format(i)
    print(url)

2.英文词频统计预处理

• 下载一首英文的歌词或文章或小说。
• 将所有大写转换为小写
• 将所有其他做分隔符（,.？！）替换为空格
• 分隔出一个一个的单词
• 并统计单词出现的次数。

text='''Keeps repeating itself, what else can I say
You wondering why I act this way
Never should have gave you the time of day
There must of been a gust of wind
Cause you change your mind everytime it blows
And you just changed it a motherfvckin again
You just said you just wanted some dick 'fore i stuck it in
I wouldnt of been such a prick to you
Fvckin men you say you dont trust em
Why do I hear the sound of toilets flushing
Some shit is goin down
You must've just not of been truthful from the start
See for me it'd be nothing to say you never had my heart
But I'd be lyin
Fvckin see why they call this bullshit a relationship, ships sink
And you know its love as soon as you fall in it cause shit stinks
And it feels like everytime i fvckin do i get jynxed
Cupid must've put a curse on me
weeks have went buy and we only spoke twice
I'm sittin in your driveway callin' you from the car
Suffice I think its safe to say you're not at home
I'm callin your cell phone you answer
But I can tell though that you're not alone
How was I to know it should of been time to go a long time ago
I kept holdin on
Why I couldnt get the hint
You feel the draft you were throwin I wasnt catchin' your drift
But theres a cold breeze blowin over me
Im over you, success is the best revenge to pay you back
And that payment is overdo'''

#去标点符号
s=',.?:;'
for c in s:
  text = text.replace(c,'')

#转化为小写
text=text.lower()

#分割并显示
atext=text.split()
print(atext)

#统计词频
print("计算单词出现的次数:")
strSet=set(text)
for word in atext:
   print(word,text.count(word))

3.文件操作

• 同一目录、绝对路径、相对路径
• 凯撒密码：从文件读入密函，进行加密或解密，保存到文件。

  file=open("a.txt")
  print('已成功在文件读取文本')
  dumi=file.read()
  kaisamima=""
  for i in dumi:
      kaisamima=kaisamima+chr(ord(i)+3)
  file = open("kaisamima.txt", 'w')
  file.write(kaisamima)
  file.close()
  print('已成功保存凯撒密码到文件！')

• 
• 

• 词频统计：下载一首英文的歌词或文章或小说，保存为utf8文件。从文件读入文本进行处理。

file=open("singe.text")
text=file.read()
#去标点符号
s=',.?:;'
for c in s:
  text = text.replace(c,'')

#转化为小写
text=text.lower()

#分割并显示
atext=text.split()
print(atext)

#统计词频
print("计算单词出现的次数:")
strSet=set(text)
for word in atext:
   print(word,text.count(word))

 

 4.函数定义

• 加密函数

• def bianma():
    code=input("请您输入文字：")
    print("转化成凯撒密码为")
    for i in code:
      print(chr(ord(i)+3),end='')
    return
  bianma()

  

• 解密函数

• def jiema():
    code=input("请您输入凯撒密码：")
    for i in code:
      print(chr(ord(i)-3),end='')
    return
  jiema()

  

• 读文本函数

• def duwenben():
    file=open("a.txt")
    wenben=file.read()
    print('已成功读取文本')
  b=duwenben()