数据预操作

1.字符串操作：

• 解析身份证号：生日、性别、出生地等。
• 凯撒密码编码与解码
• 网址观察与批量生成

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，保存为utf8文件。
• 从文件读出字符串。
• 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。

上面这些是老师的。

 1

• 解析身份证号：生日、性别、出生地等。
  

  ID = input(‘请输入十八位身份证号码: ‘)
  if len(ID) == 18:
      print("你的身份证号码是 " + ID)
  else:
      print("错误的身份证号码")
  
  ID_add = ID[0:6]
  ID_birth = ID[6:14]
  ID_sex = ID[14:17]
  ID_check = ID[17]
  year = ID_birth[0:4]
  moon = ID_birth[4:6]
  day = ID_birth[6:8]
  print("生日: " + year + ‘年‘ + moon + ‘月‘ + day + ‘日‘)
  
  if int(ID_sex) % 2 == 0:
      print(‘性别：女‘)
  else:
      print(‘性别：男‘)
  
  W = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2]
  ID_num = [18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2]
  ID_CHECK = [‘1‘, ‘0‘, ‘X‘, ‘9‘, ‘8‘, ‘7‘, ‘6‘, ‘5‘, ‘4‘, ‘3‘, ‘2‘]
  ID_aXw = 0
  for i in range(len(W)):
      ID_aXw = ID_aXw + int(ID[i]) * W[i]
  ID_Check = ID_aXw % 11
  if ID_check == ID_CHECK[ID_Check]:
      print(‘正确的身份证号码‘)
  else:
      print(‘错误的身份证号码‘)

   

• 凯撒密码编码与解码
  

  import os
  def encryption():
      str_raw = input("请输入明文：")
      k = int(input("请输入位移值："))
      str_change = str_raw.lower()
      str_list = list(str_change)
      str_list_encry = str_list
      i = 0
      while i < len(str_list):
          if ord(str_list[i]) < 123-k:
              str_list_encry[i] = chr(ord(str_list[i]) + k)
          else:
              str_list_encry[i] = chr(ord(str_list[i]) + k - 26)
          i = i+1
      print ("加密结果为："+"".join(str_list_encry))
  def decryption():
      str_raw = input("请输入密文：")
      k = int(input("请输入位移值："))
      str_change = str_raw.lower()
      str_list = list(str_change)
      str_list_decry = str_list
      i = 0
      while i < len(str_list):
          if ord(str_list[i]) >= 97+k:
              str_list_decry[i] = chr(ord(str_list[i]) - k)
          else:
              str_list_decry[i] = chr(ord(str_list[i]) + 26 - k)
          i = i+1
      print ("解密结果为："+"".join(str_list_decry))
  while True:
          encryption()
          decryption()
          choice = input("continue? Y/N")
          if choice == "Y":
              continue;
          else:
              exit(0)
  
  

   

• 网址观察与批量生成
  bilibili热门视频链接
  

  import requests
  from bs4 import BeautifulSoup
  import os
  
  url = ‘https://www.bilibili.com/ranking/all/4/1/7/?spm_id_from=333.334.b_72616e6b696e675f67616d65.15‘
  
  parser = ‘html.parser‘
  
  header = {
      ‘User-Agent‘:‘Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.104 Safari/537.36‘,  
      "Accept-Language":"zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3",
      "Accept-Encoding":"gzip, deflate",
      "Referer":"http://bilibili.com/",
      "Cookie":"safedog-flow-item=; bdshare_firstime=1504530621757",
      "Connection":"keep-alive",
      "Upgrade-Insecure-Requests":"1",
      "Cache-Control":"max-age=0"
           }
  for cur_page in range(1, int(preview_page_cnt) + 1):
      cur_url = url + str(cur_page)
      cur_page = requests.get(cur_url, headers=header)
      soup = BeautifulSoup(cur_page.text, parser)
      for link in soup.find_all(‘a‘,target=‘_blank‘):
          print(link.get(‘href‘))

  
  
  2.
  歌曲

  Stand up, all victims of oppression
  　　For the tyrants fear your might
  　　Don‘t cling so hard to your possessions
  　　For you have nothing, if you have no rights
  　　Let racist ignorance be ended
  　　For respect makes the empires fall
  　　Freedom is merely privilege extended
  　　Unless enjoyed by one and all.
  　　
  　　So come brothers and sisters
  　　For the struggle carries on
  　　The Internationale
  　　Unites the world in song
  　　So comrades come rally
  　　For this is the time and place
  　　The international ideal
  　　Unites the human race
  　　
  　　Let no one build walls to divide us
  　　Walls of hatred nor walls of stone
  　　Come greet the dawn and stand beside us
  　　We‘ll live together or we‘ll die alone
  　　In our world poisoned by exploitation
  　　Those who have taken, now they must give
  　　And end the vanity of nations
  　　We‘ve one but one Earth on which to live
  　　
  　　So come brothers and sisters
  　　For the struggle carries on
  　　The Internationale
  　　Unites the world in song
  　　So comrades come rally
  　　For this is the time and place
  　　The international ideal
  　　Unites the human race
  　　
  　　And so begins the final drama
  　　In the streets and in the fields
  　　We stand unbowed before their armour
  　　We defy their guns and shields
  　　When we fight, provoked by their aggression
  　　Let us be inspired by life and love
  　　For though they offer us concessions
  　　Change will not come from above.
  　　
  　　So come brothers and sisters
  　　For the struggle carries on
  　　The Internationale
  　　Unites the world in song
  　　So comrades come rally
  　　For this is the time and place
  　　The international ideal
  　　Unites the human race
  

  　　代码

  resoult={}
  str=",.?!  "
  op=0
  with open("pa.txt","r",encoding="utf8",errors="ignore") as  f:
      text=f.read()
  for i in range(4):
      text=text.replace(str[i]," ")
      print(text)
  for i in range(100):
      alist = text.split(" ")
      result=text.count(alist[i])
      print(alist[i])
      print(result)