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=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")
year=ID[6:10]
moon=ID[10:12]
day=ID[12:14]
ID_sex=ID[16:17]
ID_check=ID[17]
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:
  print (u"1. 加密")
  print (u"2. 解密")
  choice = input("请选择：")
  if choice == "1":
    encryption()
  elif choice == "2":
    decryption()
  else:
    print (u"您的输入有误！")

网址观察与批量生成

for i in range(2,15):
    print('http://news.gzcc.cn/html/xiaoyuanxinwen/{}.html'.format(i))

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

STR='''
Twinkle  twinkle  little star 
How I wonder what you are 
Up above the world so high 
Like a diamond in the sky 
Twinkle  twinkle  little star 
How I wonder what you are 
Twinkle  twinkle  little star 
How I wonder what you are 
Up above the world so high 
Like a diamond in the sky 
Twinkle  twinkle  little star 
How I wonder what you are 
Twinkle  twinkle  little star 
How I wonder what you are 
Twinkle  twinkle  little star 
How I wonder what you are
'''
STR = STR.lower()#将所有大写转换为小写
print(STR)
s = ',.？！'
for i in s:
   STR = STR.replace(i,' ')#将所有其他做分隔符（,.？！）替换为空格
print(STR)
STR = STR.split()#分隔出一个一个的单词
print(STR)
InfoSet = set(STR)
Count = {}
for word in InfoSet:
    Count.setdefault(word,STR.count(word))#统计单词出现的次数
print(Count)

3.文件操作

凯撒密码：从文件读入密函，进行加密或解密，保存到文件。

def getMima():
    Massage = str(input("输入明文并保存文本:"))
    with open('excise1.txt','w') as f:
        f.write(Massage)
        f.close()
    Mima = ''
    for i in Massage:
        Mima = Mima + chr(ord(i)+2)
    print('加密结果:'+Mima+'\n')
    with open('excise2.txt','w') as f:
        f.write(Mima)
        f.close()

def getMassageFromTXT():
    print("对文本内容解码..")
    with open('excise2.txt','r') as f:
        s = f.read()
    Massage = ''
    if s == None:
        print('没有可解码的文本\n')
    else:
        for i in s:
            Massage = Massage + chr(ord(i)-2)
        print('解码结果:'+Massage+'\n')

if __name__ == '__main__':
    while 1:
        a = int(input('加密(1)解码(2)退出(0):'))
        if a == 0:
            break
        elif a == 1:
            getMima()
        elif a == 2:
            getMassageFromTXT()

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

song = '''Twinkle  twinkle  little star 
How I wonder what you are 
Up above the world so high 
Like a diamond in the sky 
Twinkle  twinkle  little star 
How I wonder what you are 
Twinkle  twinkle  little star 
How I wonder what you are 
Up above the world so high 
Like a diamond in the sky 
Twinkle  twinkle  little star 
How I wonder what you are 
Twinkle  twinkle  little star 
How I wonder what you are 
Twinkle  twinkle  little star 
How I wonder what you areound that type of environment.
'''
f = open('excise.txt','a',encoding='utf-8')
f.write(song)
f.close()

4.函数定义

加密函数

解密函数

def getMima():
    Massage = str(input("输入明文并保存文本:"))
    with open('excise1.txt','w') as f:
        f.write(Massage)
        f.close()
    Mima = ''
    for i in Massage:
        Mima = Mima + chr(ord(i)+2)
    print('加密结果:'+Mima+'\n')
    with open('excise2.txt','w') as f:
        f.write(Mima)
        f.close()

def getMassageFromTXT():
    print("对文本内容解码..")
    with open('excise2.txt','r') as f:
        s = f.read()
    Massage = ''
    if s == None:
        print('没有可解码的文本\n')
    else:
        for i in s:
            Massage = Massage + chr(ord(i)-2)
        print('解码结果:'+Massage+'\n')

if __name__ == '__main__':
    while 1:
        a = int(input('加密(1)解码(2)退出(0):'))
        if a == 0:
            break
        elif a == 1:
            getMima()
        elif a == 2:
            getMassageFromTXT()

读文本函数

def read():
    f = open('excise.txt','r')
    s = f.read()
    print(s)
    f.close()

if __name__=='__main__':
    read()

posted @ 2019-03-11 16:19 L杉阅读(108) 评论(0) 编辑收藏举报

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