利用Python产生加密表和解密表的实现方法

#------------------------------简单难度-----------------------------------
def Load_file_easy(path):
  #[注]返回值是一个set，不可进行数字索引
  file = open(path,'r',encoding='utf8')
  Str = file.read()
  Str = set(Str)
  file.close()
  return Str
def Encode_easy(Lstr):
  Sstr = list(set(Lstr))
  Encode_Dict = {}
  for i in range(len(Lstr)):
    Encode_Dict[Sstr[i]] = i
  return Encode_Dict
def Decode_easy(Encode_dict):
  List1 = Encode_dict.keys()
  List2 = Encode_dict.values()
  Decode_Dict = dict(list(zip(List2,List1)))
  return Decode_Dict
 
path = 'SanGuo.txt'
Str = list(Load_file_easy(path))
Encode_dict = Encode_easy(Str)
Decode_dict = Decode_easy(Encode_dict)
#写入同级目录下的文件中，如果不存在文件，则会新创建
#(博主的运行环境是：Ubuntu，win系统的小伙伴可能会在文件末尾加上.txt 啥的,略略略)
with open('easy_degree_Encode_dict','w') as file:
  file.write(str(Encode_dict))
with open('easy_degree_Decode_dict','w') as file:
  file.write(str(Decode_dict))

def Load_file_middle(path):
  with open(path,'r',encoding='utf8') as file:
    Str = file.read()
  return Str
 
def Encode(Str):
  Encode_dict = {}
  #得到页数
  for i in range(len(Str)//400):
    page = i + 1
    temp = Str[(i*400):(400*(i+1))]
    page_str = str(page)
    page_str = page_str.zfill(4)   
    #得到行号row和列号col
    for j in range(400):
      col = str(j)
      col = col.zfill(2)
    #这里稍微说一下：比如02是第三列，12是第13列，112是第13列，看看规律就可以了
      if int(col[-2])%2 ==0:
        col = int(col[-1]) + 1
      else:
        col = int(col[-1]) + 11
      row = str(j//20 +1)
      row = row.zfill(2)
      col = (str(col)).zfill(2)
      #print(page_str,row,col)
      Encode_dict[temp[j]] = page_str+row+str(col)
  return Encode_dict

def Decode(Encode_dict):
  List1 = Encode_dict.keys()
  List2 = Encode_dict.values()
  Decode_Dict = dict(list(zip(List2,List1)))
  return Decode_Dict

path = 'SanGuo.txt'
Str = list(Load_file_middle(path))
Encode_dict = Encode(Str)
Decode_dict = Decode(Encode_dict)
with open('middle_low_degree_Encode_dict','w') as file:
  file.write(str(Encode_dict))
with open('middle_low_degree_Decode_dict','w') as file:
  file.write(str(Decode_dict))

import re
import requests
 
def Crawler(url):
  #url2 = 'https://www.diyifanwen.com/yanjianggao/yingyuyanjianggao/'
  response = requests.get(url).content.decode('gbk','ignore')
  html = response
  #正则表达式
  #example_for_2 = re.compile(r'<li><a.*"_blank".*"(.*"iTit">\s*<a href="(.*" rel="external nofollow" target="_blank">.*"mainText">\s*(.*"success")
def Deleter_Chiness(str):
  #删掉汉字、符号等
  result1 = re.sub('[<p> </p> u3000]','',str)
  result = ''.join(re.findall(r'[A-Za-z]', result1))
  return result

import Crawler
 
#产生一个密文加密表
def Creat_cipher_dict(num=5):
  cipher_dict = {}
  chri = [chr(i) for i in range(97,123)]
 
  for i in range(26-num):
    cipher_dict[chri[i]] = chr(ord(chri[i])+num)
  for i in range(num):
    cipher_dict[chri[26-num+i]] = chr(ord(chri[i]))
  return cipher_dict
def Get_Frequency(Str):
  Frequency = [0] * 26
  cnt = 0
  chri = [chr(i) for i in range(97, 123)]
  Frequency_dict = {}
  for i in range(len(Str)):
    Ascii = ord(Str[i]) - 97
    # 排除一些还存在的异常字符
    if Ascii >= 0 and Ascii <= 25:
      Frequency[Ascii] += 1
      cnt += 1
      Frequency_dict[chr(Ascii+97)] = Frequency[Ascii]
  for key in Frequency_dict.keys():
    #Frequency[i] = Frequency[i] / cnt
    Frequency_dict[key] = Frequency_dict[key]/cnt
  Frequency_dict = sorted(Frequency_dict.items(),key = lambda x:x[1],reverse=True)
  return dict(Frequency_dict)
def Decode(cipher,org):
  Frequency_for_cipher = Get_Frequency(cipher)
  Frequency_for_org = Get_Frequency(org)
  #print(Frequency_for_org)
  #print(Frequency_for_cipher)
  Decode_dict = {}
  Frequency = list(Frequency_for_org.keys())
  i = 0
  for key in list(Frequency_for_cipher.keys()):
    Decode_dict[key] = Frequency[i]
    i +=1
  return Decode_dict
def main():
  #爬取文章作为提取明文概率的计算文本
  for i in range(1,15):
    url = 'https://edu.pcbaby.com.cn/resource/yjg/yy/'+'index_'+str(i)+'.html'
    try:
      Fil = Crawler.Crawler(url)
      eassy = Crawler.Deleter_Chiness(Fil)
      path = 'eassy_org'
      Crawler.WriteIntoFile(path,eassy)
    except :
      print("爬虫发生意外！")
  
  path = 'eassy_org'
  with open(path) as file:
    org = str(file.read().splitlines())
    org = org.lower()
   #创建一个密文
  cipher_dict = Creat_cipher_dict(5)
  print(cipher_dict)
  #这里密文我已经爬取好了，存在本地了，爬取过程同上面大同小异
  with open('eassy_cipher','r') as file:
    Fil2 = str(file.read().splitlines())
    Fil2 = Fil2.lower()
  cipher = []
  for i in range(len(Fil2)):
    if ord(Fil2[i])>=97 and ord(Fil2[i])<=123:
      cipher.append(cipher_dict[Fil2[i]])
  #至此 ，密文产生好了，每一个字母的概率也计算好了，可以说，工作完成了一大半了
  Decode_dict = Decode(cipher,org)
  print(Decode_dict)
if __name__ == '__main__':
  main()